There are dozens of mercs in town to choose from. I've used a few /claim tokens to open up some of them but there doesn't seem to be a way to tell which ones they are without talking to every single npc. Is there any way to know which mercs you've unlocked?
If you hover your mouse pointer over the merc in its cell, you should see the name it has. If you just have the coin, nope. It just says you have a merc. I'm sure someone more knowledgable than me will pop by and correct any mistakes I have made.