For each class. Player characters excluded. Felwinter for Warlocks? Saint-14 for Titans?
Most badass Warlock: Ikora. Boring as she seems in game, she's more than capable of beating Shaxx in his own Crucible and would've hunted down Uldren herself if given the opportunity. Most badass Titan: Saint-14. Imagine mixing Doomguy with Android 16 then givin him a Russian accent; speaks for itself. Most badass Hunter: Eris Morn. We're well acquainted with how her character is at this point.