The neutral biped is fully rigged and deliberately styleless. Its clips are grouped by what they do, from walking and vaulting to pistol, melee and magic combat, reactions, social gestures and swimming.
Upload a rigged GLB and map its bones onto the shared skeleton, or place a few landmarks on an unrigged mesh and let auto-rig build the skeleton for you. Either way, all 45 clips play on your character.
Characters have a name, a team and placements in the world. Give a placement a patrol route with waypoints and dwell times and it walks it in Preview and in the published game.