Reposting one of my oldest content, now on the Dungeon World Omnibus!
The Balefire of Rage.
A psionic class, based on using your anger to enhance yourself. In my game/stuff i wrote psi is deeply connected to emmotions for most. Only moments of strong emotional impact can trigger your latent psionic abilities.
Psi is a ressource you can spend to do stuff but it also can enhance you while you hold it. That is true for all my psionic stuff. Since psi users are deeply emotional they sometimes get additional bonds and can share their gits with people they share an emotional connection with.
I think these things make for enough of a mechanical identity.
Major influences on these are Sith Warriors and the Ardent Class from 4e.
Feedback is of course always welcome.