I'd rather see a combination of Summoner and Beastmaster- While the player can create a synthetic creature modified to their own needs, they are able to buff it with "aspects" or "blessings" of Eidolon/Guardian Force style characters, rather than summon the beasts outright. Since beastmen worship these characters in Eorzea, perhaps outright summoning would not be as healthy for the game as enchantment spells casted by a player akin to the Beastmaster.