Captain Houou is a decorated orb craft pilot, formerly a mech jock with extensive combat experience.
AKA How to Ruin an Anime Series in Seven Steps
The PCs find a strange helmet, when donned it will take control of that PC and speak and act trough him/her. It explains that it is benevolent and needs their help in a quest and that it will stop possessing the PC when the task is done. Great if a player is gone for a number of sessions.