I'll try to make a short summary here.. this isn't everything / this is kinda just scratching the surface to understand the entire concept, but-

So as a whole, Critters are supposed to be little cartoon-based creatures that, depending on the type of critter (Hues = the colorful critters, Blanks = the white / off white critters, and Keys = the black goopy shapeshifters which I wont get into here) -can code little universes, represented by white cubes. The cubes are a required context I have to ramble about before I can really get into the critters themselves? So bare with me lol.
"Adding data" to a cube works anomalously?? Like the Creator-Hue just has to hold it and think about all the details they want to project into it.
The cubes themselves (like, the base / shell) are not made by the Hues, they have to come in possession of one to do all this, but:

The cubes can be Alternate Universes, or Pocket Dimensions, difference really being..

Alternate Universes:
-They are based on their own realm, and will be something like "everyone is this species" or "this event was changed in the timeline" etc etc.
-Every critter alive would automatically be generated into an AU, even other critters the creator doesn't know exists.
-They are majorly self-developing and always have a timeline which, when peering into an AU cube, can be watched from any point in it's timeline.
-In AUs, when entered (via phasing through the cube), you will appear in the form of your equivalent and be placed wherever they are in the universe (so if it's the deer AU and canon Hadel entered it, he's suddenly in the body of his equivalent, popping in the middle of whatever actual deer Hadel was doing before canon Hadel entered).
-You will retain your memories from your real realm, but your AU equivalent will simply "blank out" and not remember anything you did in their body.
-Popping back out of an AU is easy, you just have to mentally project yourself, basically (this is so the AU equivalent still exists in a less jarring state after you're out).

Pocket Universes / Pocket Dimensions:
-A completely blank slate.
-A lot more private. Can be coded so no one but the creator can peer into them.
-A pocket dimension has no limits, but doesn't auto-populate inhabitants either. You can make up new species here, a cast of fictional characters, just make it a peaceful, quiet realm to escape to with no inhabitants, generate items and stuff within it, etc etc.
-You can still alter the body of existing critters (including your own) in these too if they happen to be entered by said critters, but the creator has to specifically have that idea in mind and it is usually though on an individual basis (so Luca could purposefully code his pocket universe to make Hadel have a dick if he enters it, for example).
-These are harder to escape, because while entering ANY cube involves you phasing through it in the outer / real realm, getting out of a pocket dimension requires you to phase back through it again rather than just mentally projecting back out, so you have to keep the exit cube on you or memorize where it is.
-Similarly because you're not just projected into your equivalent's body when phasing through it and rather exit out of another "exit cube" within the pocket universe, it can be particularly dangerous for Blanks to enter these because they can be set up as death traps for them (imagine jumping into a cube and you fall 80 ft into a pool of endless razors for example).
-These usually don't have a timeline unless you fill it with your own characters or specifically code it to have one. A lot of these are used as still, quiet, peaceful realms to escape to during stress, but other Hues like to basically make TV shows out of them.
-You CAN make it self developing if you want it to be, but you have to give the cube things to work off of, like the inhabitants it's filled with, personalities for them, some type of plot device, etc etc. You can budge in and change/redirect anything from any point in it's timeline at any time.
-The inner universe can come in any "style" (be realistic, look like a 3D low poly PS1 game, look pixelated, etc etc.), however unless you code specific critters to fit the design of the world, a critter entering it will retain their canon cartoon style.

Okay now, summary of the types:

Hues:
-Colorful, sometimes have markings
-Omnivorous
-Can add data to cubes / claim them
-Can enter their OWN cube, but cannot take anything originating from them out of them.
-Like 99.99% of the population
-Have animal-like traits such as purring, hissing, growling, becoming territorial or possessive of mates, going into heat or rut, having heightened senses to various degrees, emitting pheromones, and scent-marking (their mates, especially in rut).
-Have cartoon-like traits such as physical 2-D features, cartoonish movements / body language, rapid healing properties (parodying a character in a cartoon show being majorly injured and then fine in the next episode), resistance to death (parodying cartoon pain humor, they CAN still die though), and agelessness (parodying 20 season cartoons where characters never age; their "physical age cap" is completely random, some critters will stop aging at 15, some at 30, some at 80, etc.)

Blanks:
-White or off-white (pure white Blanks are called "pure breds", they only happen if both parents are Blank (even if both are off-white)). Have no markings / are solid colored.
-Lack the ability to claim or add data to a cube.
-Can enter ANYONE'S cube, and take things and other Critters in and out of them freely.
-Are nearly extinct.
-Have all the animal and cartoon traits as Hues do
-Additionally have "feralism" traits, which are triggered episodes based on fear, anger, or mania where the Blank gains a disassociative and animalistic mind. If triggered by fear or anger they can become super aggressive and unconscious / out of control, if triggered by mania, its more just like.. a dog with zoomies (also, if a Blank with zoomies is around other Blanks, it often triggers the other Blanks to snap into zoomies too).
-All have super sharp, pointy teeth and the ability to inject venom in their bite. This is controllable UNLESS they are feral.
-Carnivorous only, chocolate and dairy can make them sick, but their bodies are resistant to parasites and diseases raw meat or spoiled food can carry.
-Can be extremely food-possessive when starved. Placing a slab of meat in front of a starving Blank can cause them to go feral and attack others hovering around them and the food.
-Considered dangerous in their society, like animals that you need to be constantly wary around (however this is majorly untrue and a fear tactic by those leading their society. Blanks rarely go feral out of aggression even when intimidated or afraid. The more traumatized a Blank is, the easier it is to trigger their feralism (like Hadel gets triggered all the time), but there are many Blanks who have never gone feral their entire lives).

Part of the deeper lore of why Blanks are both so rare and why they are so needlessly feared is because of their interactive ability with the cubes that Hues lack and events or propaganda pushed centuries ago that, at this point, is mindlessly still subtly followed. The people at the top don't like them because they fear Hues cooperating with Blanks can be used to overthrow them, so a long ass time ago, Blanks mysteriously started disappearing en masse, and the ones remaining had their biology used against them to be feared and degraded within their society to keep them in place and keep Blanks and Hues from harmonizing.

Cos I mentioned it in the original thread during his episode (when he was spam replying to me) right before I got the anons. It doesn't matter if YOU personally think it's "tame", I don't. I'm a small account and I've never had people send me things like this before, especially from someone with 20x more followers than me? You cannot be acting like that.

Not to mention the fact that what he mocked me over was something extremely traumatic for me? My SW was p much all rape forced upon me to begin with, which included my abuser having agreed to things he knew triggered me (he ran the account and pretended to be me towards our customers) which was also mentioned in the thread.
AS WELL AS the fact that I've explained several times the reason my body is covered in deep scars was because my psychosis from my schizophrenia put me in a state where I thought I needed to mutilate my body so badly that no one would want to rape me again. I had to relearn how to love my body after I was too far in it. Clearly his "no one would touch you" comment was a very targeted attack by him, he literally used my traumas against me. It's one thing to come up with random base level insults, it's another to completely target someone's traumas and deep insecurities caused by trauma.

How cruel of a person do you need to be to mock someone over something that traumatic?

If he's willing to hide behind anon to send such cruel messages- messages and harassment that DOES get people killed or harmed if it causes them to relapse -then he doesn't honestly deserve to be platformed or supported.

It also doesn't matter if it turns out that he didn't know the extent of my SW, there are seldom cases were SW isn't traumatic whether it be heaps of shaming you deal with (which I was not doing), ppl using ur pics against u to irls if you're doxxed, or rape irl. He of all people should know this but clearly he doesn't care abt SWers.

Lastly your sex work shouldn't be putting people in danger and that was the only concern I had. But obviously Apollo doesn't care about the mental or physical health of anyone outside of himself, he's made that very obvious.

I will admit to the T thing tho, I was just really drunk and triggered, having relapsed myself over this.

I'm not really sure, I honestly don't usually make my OCs plural except for Hadel, and I just kind of write him based on experiences- like he's a self insert so I base his plurality on mine. Plurality is a very vast and fluid thing, so there's many different ways to experience it, and trying to explain how one would write it to someone who (I'm assuming?) is non-plural would be a bit more tricky bc of that.

I suppose try and think of why they would have headmates and alters. For example all 3 of my alters have very clear purposes for me, and it's all in regards to my traumas and other mental diagnoses and symptoms. Waves of stress and psychosis and stuff. Lots of amnesia too if you're switching often bc of stressful events.

-My persecutor and protector alter was formed because I had troubled standing up to my abusers. Now he is also just generally feisty or defensive (like a guard dog) with people, but it's obvious where all those emotions he has stemmed from. (As an example) you could reflect how an alter like this could even be troublesome because they are more aggressive (if even just verbally) while the host is shy and soft and easy to walk on. Picking up after his battles with people when they weren't necessary was always a stressful thing for me to come back to until we were able to talk it out and he settled down a bit more.

-My little / child alter was made to be a barrier against stress. They usually only front during times of severe stress or when I get extremely triggered. They can either block everything currently going on out and be sorta numb, happy go lucky, and playful, or if triggered while active can be overwhelming, extreme, intense. etc. Usually littles have both extremes. A sense of playful ageregessiveness vs a tantrum.

-My caretaker alter helps me- take care of myself lol. Calms me down when I have a panic attack, helps me keep track of things like meds and trying to stay away from negative influences or substances, etc etc. They can also front during times of stress in order to take the edge off for me, but since they don't get that numbing catatonia like my little does, it still stresses them out too. It's less of a distraction and moment of ignorant bliss and more of them taking the pain for me. My persecutor is like this too, but usually he's put in that spot only if I can't front myself and he's forced to.

There's other things to consider ig like for my system, there is A LOT of co-fronting which can take form in several different ways but primarily it's two or more alters and/or headmates being able to talk and be present at the same time.
Cofronting can allow an alter or headmate to touch you physically (I often fall asleep being held or I can feel them touch my face, etc etc)
They can also "feel" or control certain parts of your body while you feel / control others, this is usually how members of a system will be sexually intimate with each other. A cofronting alter can also project onto objects, so maybe if your sense of their touch isn't so strong, they can project onto a pillow or a toy. etc etc.

There's also things like alters being an extension of self vs a whole unique individual.
Usually for my extensions, there's less cofronting and touching. Not entirely absent of it, but less. There's also overlap of traits a lot of the time, or when cofronting, it can be confusing to tell who I actively am.
While unique alters can be a lot more active with me, and it's a lot easier to tell who is explicitly fronting, however there can be more amnesia that comes with them fronting alone (there can still be a lot of it when it comes to extensions too, it's really based on stress).

I don't tend to have these, but other systems often gain characters from medias they enjoy as alters because it's a comfort thing- they distract systems from stress as well. They're no less valid than having an alter be unrelated to someone else's media, these would usually be less extension of selves and more unique separate individuals. Usually.

Ig other tiny tidbits to keep in mind on how exactly to showcase it is, some systems are really open about the fact they are plural and who is currently fronting, while I find in person (and also with my system online as well), a lot of alters don't like to mark when they're currently fronting. They prefer it to be vague to others unless absolutely needing to- or feel comfortable specifying.
Usually there is an overall name an entire system can go by in person for general life things- usually the main host or most active's name, for example we use Ninya or Pest as a whole system while I, who'd usually be seen as the host (altho I don't personally like using the word host in this system for personal reasons) am named Jesse.

So what I mean by all that is, I in my day to day life don't really talk about being a system or talk about my alters in person aside from with my therapist. I barely do it online either. If my persecutor is fronting while we're at work, he'll go by my name. If someone online thinks it's me, he usually wont correct them. I don't tend to talk out loud to my system because I don't need to either, you'd truly tend to showcase who is fronting more out of how that alter acts in writing.

But again, all systems are different. This is just a huge deep dive into my own mainly. I only ask with me opening up and sharing all of this with you guys, people don't try and investigate who is and isn't a part of my system. It's incredibly rude and while other systems are open about who is and isn't an alter in their life, we don't generally like to be.

Nah I imagine Sauce is straight for puppygirls only (but sometimes acts kinda queer uhh if that makes sense?? Like think of like... almosttt Jimmy Urine energy?? or gay jokes in sitcoms- anything that comes off gay between him and Murphy would be more of a joke bc of their normal hate filled dynamic). And Murphy hates him and is at most bisexual + aro. They're just housemates in a trailer home, only together bc they can't make a living separated. They met bc of craigslist.

I view them like a good set up for a really old, choppy 2000s newgrounds or youtube animated series with terrible mic quality, yknow what I mean? They are near opposites and get into horrific shenanigans all of the time. Murphy can't stand Sauce but he would probably not let him die either.. because then rent would be harder to pay. And Sauce is just enjoying every moment he can annoy Murphy with his constant, loud, puppygirl hookups.

They grow onto each other like.. if Sauce disappears, Murphy would be like "oh god it's too quiet, I can't sleep with this ringing silence.. I need to get Sauce back" lmaoo but like, he's also always going to act like he can't stand Sauce the moment he gets him back. That kind of dynamic. And if Murphy disappeared, Sauce would get annoyed that the house isn't cleaning itself. Etc etc.

Cute! but could only be an AU thing. Hadel thinks of himself as a "hard boy", I can't see him willingfully wearing them. He'd already be extremely embarrassed if anyone else knew how much Luca babies him as is.

Ludel in canon have like.. a similar...??? dynamic as like ABDL x Caretaker, but if instead of being age-regressed to a toddler-like mind, Hadel is age-regressed permanently as like a young teen-like mind... if that makes sense LMAO. Very ornery and needy and careless. Obviously wants a partner that treats him more like he's their son ..but with sex and kisses too.

After his trauma, he age-regresses further during episodes / psychotic breakdowns or catatonia, but its still not like an ABDL thing, he just needs cuddles, stuffies, a good animated kids movie, and extra careful pampering.

So ig like ABDL Hadel would not be.. too far fetched? Not my thing truly, but I'm not entirely against anything either pfft.