Heya, I'm very new too, so do bear that in mind. I'm also in a similar boat (3-4 friends to play with, non competitive scene). I've had a blast playing Seamus, being able to teleport about and shoot stuff is great fun, and easy to learn/get into. The belles, SYbelle and Copy cat are all also quite fun to use, and tend to synagise really well.
I've honestly not played or looked too much into Reva so couldnt help you with a comparision, but I'd deffo put in a good word for Seamus being fun and a useful crew box!