it is 5am & i've been up answering asks, so i will refrain from elaborating. but the vibes i get for funsies (this all whether they could be aware of it themselves or not),

yg: cis masc/butch man, pan or bi or w/e label is simplest to him. could see him on the demisexual spectrum but i'm not rlly convinced. can also see him being butch4butch, but...doesn't rlly hold up to scrutiny
jm: transfemme. i expect he identifies as a fluid enby. likes men, prob considers himself gay or just calls himself queer
hs: cis man, but limp wrist. i think he can get around with women but prefers men. doesn't give me a label vibe bc i don't ~sense that he's thought abt it very much, just not straight or umbrella "gay"
jk: mostly cis man, could be a vague undefined enby. huge bisexual energy, tho i think he's pickier with men
th: refuses to commit to being any gender or sexuality, despite being cis & preferring women romantically. seems like the type who would try anything out of curiosity
nj: cis man + straight, but heteroflexible. he seems like he deliberately keeps an open mind abt partners. in any case, he's straight but with a highly reflective rainbow sheen
sj: cis man & straight. he's the straightest in the group to me, he's just a shy nerdy type

that makes me very happy!! i have Strong opinions abt the animal emojis lol

as for colors, idk abt any official colors. if you mean their mics, those are chosen by the members. but i personally associate them with,

yg: black, browns & dark neutrals. cool deep blues/purples & cool tones overall. but sometimes gold or deep red & darker warms (like warm, rich browns), or a fire. black is the strongest, tho
jm: golds/yellows, pinks, oranges, white, and blues. some black. lighter colors with some richer, darker midtones mixed in. anything pastel or shimmery goes to him. peachy neutrals. gold or pink is at the top for him.
sj: pink, black, white, blue. cool gray or warm light neutrals. except black, lighter tones, including some pastels. he's the most neutral to me & shifts between warm/cool. that or he's like...christmas.
nj: all shades of green. brown neutrals & any nature-y neutral. white. light blues. he always has a lighter color balancing him out or is a lighter color. prob the most brown
th: green, purple, blue, brown. all deep but saturated, not dark. midtones. any of those colors combined with p much any other color makes me think of him, esp if they clash. but i associate him the most with green/purple
jk: red, black, silver, purple, esp pinkish purple. gray neutrals. and gray itself. cool tones. but overall, i associate him the strongest with red
hs: any bright, saturated color. yellow, red, and white esp. dark brown neutrals & warm neutrals. sometimes bright but cool tones. yellow is foremost for him, but only if it's bright. if not, red

i'll give you the footnotes the best i can:

1) shipping & fanfiction is rpf, aka real person fiction. it has nothing to do with reality & is not intended to
2) therefore what the irl boys do/are is irrelevant to the validity of someone's rpf. this is why people arguing abt whose fic tropes are more "realistic" & any rhetoric that centers "realism" around rpf is nonsense
3) rpf is old as fuck & is nothing new, it has a long history & culture
4) one of the golden rules of rpf is separating your rpf & personal fantasies from the real life person they're projected at
5) the other even golder rule, and the one which the fandom doesn't follow the most, is to KEEP IT CONFINED TO RPF COMMUNITIES, IN PLACES THAT IT CANNOT REACH THE REAL LIFE PEOPLE OR ACCIDENTALLY INFLUENCE BROADER, NON-RPF FAN OR PUBLIC OPINION.
6) this is not unique to rpf, but it's worth mentioning: the don't like, don't read policy.

this is standard user guidelines for most rpf communities, at least in my experience. but fandom as a whole is just ignorant of its own history now. esp on twt.