I'm sure everyone in the community will agree to this one.
It would be fairly easy; remove them as inventory items and make the collection system similar to that of the gold and rift shards'.
I'll add onto this list as long as I can.
2) Have an Icon next to all teammates using Unity.
3) Give the ability to inspect teammates even if they are in a different area but still in your game. Its silly that I have to go to the Profile first, then hit Heroes and then I have the option to Inspect. Too many steps.