Kakou currently has 3 official guardians.
1. Alek Ronso (Ronso Warrior, like kamari)
2. Luscinia (Black mage like LuLu)
3. Zecht (swordsman like Auron)
Now Kakou is only going to have about 4-5 guardians and no more than that. Probably only 4. So there is still a space open.