Simply say what your character name is followed by your character code (used to distinguish between people with the same character name); I can then put it on this main list (which currently only has me) along with your TF2F name so people know who they're adding.
TF2F Name: Twilight Mage
SC2 Name: Manawarp
Character Code: 763
TF2F Name: chunkygorillas
SC2 Name: chunkygorill (didn't notice that I went over the character limit so now I'm stuck with an un-finished name :S)
Character Code: 217
TF2F name: Rizz
SC2 name: Rizz
Character Code: 124
By going to you friends list in SC2 and clicking add a friend you can see your character code or use somebody else's name and character code to add them.
I'll come back here to update this main post with character names + identifier codes as people post them here.