interesting! (as a disclaimer, i have zero experience with DnD, so this is going to be wildly amateurish.)
Ophelia: Half-Elf sorcerer, specializes in celestial arcane magic
Penelope: Elven Cleric
Kinesa: Air Genasi Rogue

I can see Norrie as a White Mage!! The Idols are obviously dancers 😌

Balei would be a Changeling Druid, Fausto a Human Fighter, Ziz is a Goliath Monk, Yuma a Satyr Bard, and finally Kul is a Human-Revenant Warlock

Gabriel would most likely be a warlock of some kind. In my head she's haunted by Giratina, so she would definitely have him as a patron. Not sure if she'd be a Hexblade or a regular spell slinging-lock or not. Ideas for my next campaign though? Hmm

I think she would be either Wood elf fae wanderer ranger or a Dryad summoner that summons forest creatures

Oooh Yorra would def be a high elf necromancer :3

I feel like Odd fits a little too well as a Warlock, with The Great Old One patron

... and a cat familiar

Wily would be a Dark Elf Engineer. Builds crazy shit and people assume he's evil from his looks. Is actually Chaotic good.

Estella would probably be a super cocky Elf Sorcerer. She would be the sort to confuse her natural talent for magic with actual knowledge and training. Definitely needs to be humbled by a well studied Wizard.

Despite being Human, Elio would be a Death Knight because of personal aesthetics and the class wields a sword whose design is somewhat reminiscent to his Aegislash's own in lieu of it's unusual typing.

Avian is everyone's favourite background human NPC who can't catch a break for the life of him but it just endears him to everybody.

This is both easy and difficult to answer at the same time because class wise, Jin = Monk and Mary = Bard. Easy. But I don't know enough about the available races in DnD to confidently say which they would be and just normal humans feels boring...