Ash - Rogue assasin, self explanatory
Atlas - A druid with earth elementals, but probably multiclassed to barbarrian/monk
Banshee - hard to tell, a lot of illusion magic, so maybe a wizard?
Chroma - Sorcerer with draconic heritage?
Ember - Another sorcerer. She would be a fire genasi, I imagine.
Equinox - that one is tricky. I think a homebrew class? Any ideas?
Excalibur - Thats a fighter. Maybe multiclassed to warlock to get pact of the blade for his exalted weapon.
Frost - Sorcerer, just like Ember.
Gara - Artificer perhaps? Heavy focus on glass devices, sounds possible for her.
Garuda - a warlock, with her bloodsucking abilities.
Gauss - He goes fast. There must be a min max build to make a character go zoom.
Hildryn - Our shield mama is an artificer with power armor.
Hydroid - warlock with a cthullu patron
Inaros - Melee heavy warframe that sacrifices his health for power and doesn't use shields? That's a barbarian.
Khora - and our second ranger, a beast master with her Venari.
Limbo - a wizard. In his lore he is super nerdy with math, and wizards generally work hard to get their powers.
Loki - A rogue? Hard to tell
Mesa - Artificer/gunslinger. Think Percy from 1st criticall role campaign.
Nekros - Nekromancer, obviously
Nezha - A paladin. He has some support potential, and generally works in almost every situation
Nidus - A druid, circle of spores. There is no other way.
Nyx - high charisma score for all of those mind control powers, so a bard, maybe?
Oberon - another stereotypical druid
Saryn - a druid of spores, just like nidus?
Trinity - A classic cleric
Wisp - Another tricky one.
Wukong - Definitely a monk.
I couldn't figure it all out. Any ideas?