Well he created more than just the Beastmen. He created all the animals, too. And since the moon was actually his battleship, we could say he was partially responsible for creating day/night as well.
I don't know about Hei, but Anime Tenchou has a great personality, but he's not go much beyond that. He's an over-the-top parody of Domon who seems even more popular than Domon, which strikes me as strange.
LG's got all the qualifications for being Gar - the only thing he's a tad deficient in is personality, but that's probably because we didn't get to see much of his person. I mean, just imagining what he was like as a Spiral General should give some idea. My main impression from him in every scene except the very last one was "weary".
Anyway, voting LG.