Hmm for some reason even my old comments/voting for this role were deleted. Anyways, I like this idea and think it should be changed such that the trainee picks a role each night and will only become that role once the original one dies. This balances things out more.
Indeed a great role. Also, you should specify if he'll appear in meetings, the side he starts currently, if shrink will prevent convertion, and that kind of stuff.
Hmm, I enjoy this role, in a role where there is a Mafia Trainee, a Lawyer and a Stalker, for example, this could be a great decision to make that could affect the whole game with different strategies.