Useful commands.

[1] get_all_artifacts
[2] add_diplomacy
[3] add_intrigue
[4] add_learning
[5] add_martial
[6] add_stewardship
[7] age (edit a characters age + or -)
[8] cash (adds money, amount can be specified)
[9] charinfo (shows character id when hovering mouse over portraite)
[10] imprison (must specify character id)
[11] piety (adds money, amount can be specified)
[12] prestige (adds money, amount can be specified)
[13] max_tech (if province is not specified it will aplie to all owned)
[14] observe (lets you watch what happens in the world without you playing)
[15] play (switches you to a specified character, must include character id)
Full list https://ck2.paradoxwikis.com/Console_commands