I dont know how I am suppose to give my opinion on something that gives no specifics other than it sounds interesting.
The character class Ive played before that it reminds me of, and which I loved alot was the necromancer from Dark age of camelot. Basically your "character" became a ghost that you could control but he also had a skeleton knight pet he could command, cast spells from etc. You were leashed to it though and if you went to far from it or it died, you came back up in mortal form and had to channel for a long time to bring your pet back up.
was alot of fun. Look into it for ideas.