I had an idea for a custodial droid, that was in the jedi temple. He fled around the time of order 66, and was later transferred/rebuilt into a different chassis. He retained all his memories of listening to jedi teaching and discussion. As a result he is very philosophical, contemplative, and knowledgeable about the force. Heck, maybe he could even serve as a mentor for force using pcs.
I think a combat spec for him, for the juxtaposition of a philosopher who's also a deadly killing machine.