My Little Pony: Friendship is Magic:

• Anypony, except: Twilight Sparkle and Spike (might make exceptions, this is, befriend me before you ask or I ask you, but no Twilights)

My Little Pony (G3):

• Anyone but specially MINTY AND SPARKLEWORKS PLEASE

Them's Fightin' Herds:

• Anyone (specially Fred for Oleander)

Homestuck:

• Anyone, except: Eridan Ampora

If I've found a cannonmate I won't want more! (I think it is obvious, but meh)