I'm in the (possibly) fortunate position where I've pulled a number of high class Eddies in the last month, and I've been reading all the forum posts to decide who to start sharding up. In the last month I've pulled (and got to lvl 100):
Samurai
Viking
Navigator
Mystic
Shaman
Mummy
Vampire Hunter
Eternity
So far I've only got GRE Eddie and Soldier Eddie sharded. My team primarily consists of a mix out of Angel of Fear, Nomad, Corrupt Harpy, GCR, Warrior Buzz, Pharoah Dog - Although pulled my first SSD and working on getting him up to lvl 100.
Curious as to what people recommend focusing on sharding? I've got 8 in storage but working through arena and trooper points to get about 3 a week.