hi mousie!
this question scratches my dnd hyperfixation soooooo nicely thank you.
i have a half started dnd/fantasy fic haunting my wips, i will add a ss for what i assigned back then. i remember thinking about it a lot. without looking at that again rn here is what i would pick now.

chn - paladin
i like paladin for chn because i think rigid comitment to ideals is so easy to bend, and thats a thing i like in fic with chn. when his protectiveness becomes posessive. or the conflict between his drive to protect and his greed. tasty stuff.

maybe oath of the crown? for that guardian/sentiel/protector vibe. or, hear me out, oathbreaker. a chn who has turned his back on his orders/the kingdom he served because he had to choose between that and the kids. a chn that lives more in the morally grey space would be fun i think.

mnh - warlock or ranger
this is tough for me. i like ranger as that represents to me a highly capable person who is able to survive/thrive in circumstances others would struggle in. that seems very mnh to me, a quite confidence and an ability to lead the others through real and metaphorical wildernesses. plus, we know he's good with animals. but i like warlock too as a charisma class, because i think mnh can be charming but also unsettling. very warlock coded. a warlock with some sort of cat patron would be fun for him i think. either way he has to have a fae influence i think. thats just so mnh to me, otherworldly beautiful and a little chaotic/tricksy.

for ranger maybe fey wanderer. the idea of mnh with a sword misty stepping behind an enemy makes me drool. also a nice dex based class for our dancer feels right. for warlock maybe an archfey patron or hexblade would be good. i can see mnh being more melee then hanging back.

chngbn - paladin
i think previously i want storm herald barbarian, but i think i actually much prefer chngbn in a class that would allow him to be a tactician. i feel like paladin is right for that, plus i find chngbn so charming it makes so much sense that he'd be a charisma based class imo.

i think oath of the ancients? i like the idea of an oath that isn't about laws, but about doing what he feels is right. thats very chngbn/jutdae to me. plus oath of the ancient paladins are also supposed to protect and enjoy beauty and goodness everywhere, which means appreciating art and music. very chngbn. totally different vibe to chn's paladin, no tention between outside orders and personal thoughts/ideals - he walks his own path that he believes to be right.

hynjn - sorcerer
idk why, this was pure instinct. a charisma based class for hynjn makes sense. i also see sorcerers as dramatic, which fits imo.

maybe divine soul? high level sorcerer hynjn with angelic wings? sick af.

jsvng - bard
jsvng gets my favourite class because i just can't separate him from music. charasmatic and able to reliably turn their hand at everything, whilst also boosting their party with their presence/talent? very hn jsvng.

maybe college of lore because they're the most adhd coded bards? doco lover and bug facts guy in the college that is about collecting facts and stories and sharing them. checks out. otherwise college of eloquence as the subclass that is all about persuading/getting what they want. you see it right?

flx - druid
specifically a circle of stars druid. one because its my fave druid subclass and two because star associations with flx just make sense. i also like that a circle of stars druid focuses less on animals ect. i feel like flx is kind and caring which i associate with druid. plus they can be surprising.

an out of pocket pick i think a swashbuckler rogue would make SO much sense for flx too. charming and dexterous, fighting that looks like a performance ect. charming people and then hitting them with something unexpected.

sevngmn - wizard
an int based class for sevngmn. he is so particular and exacting about his voice that translates well to a really scholarly class to me. he seems like a back line fighter to me too, hitting hard but staying in the back.

a divination wizard seems right for sevngmn, he pays such close attention to others that it would make sense for him to be divining things. otherwise i think school of conjuration, and he conjures ultra puppyM. as a totally wild aside i think a arcane trickster rogue or an artificer.

jngn - cleric
how could i pick anything other than cleric for innie? they can also be surprisingly tanky, and i think that would be a good fit for jngn's resilience. also a wisdom based class for our maknae on top. the party composition at this point really needs a wisdom based class...

i like twilight clerics, i think they get some cool features. so im tempted to say twilight cleric but, idk i think tempest domain would fit innie.

this is horribly biased to casting classes, i'm sorry.