Every way to put Usurper on a character. One option grants it to your own court outright. See Usurper for what it does, all traits.
Pick this option 1
Choosing the option gives the character the trait.
- "Alas, I've found the throne rather comfortable."the option does: -4 LegitimacyLeader relationship: Plotting AgainstGain trait: UsurperLoses trait: RegentBecomes Royal