[Astromancer]

It occurs to me that an obcessive World Jumper with a crackpot theory is a great crosstime adventure seed. Just pick your mania and you're off.

Examples:

A nationalist would try to protect his nation and make it flourish. No matter what the cost to others.

An anti- imperialist might try to disrupt nations they see as empires. Gore Vidal saw Lincoln as an imperialist for not just allowing the dissolution of the Union. Many cranks see America as a vast imperial octopus, and would love to murder figures like Washington and the early colonists.

Racial theorists have truly warped and insane theories that could be true nightmares to figure out and unravel.