Nah, I'm with Dameg. I always felt sorry for the Ellimist.
If you try and make a friend, they'll eventually die. In the blink of an eye, in fact, since millions of years is nothing to the Ellimist. The guy is alone. As completely alone as it is possible to be.
And he couldn't make an immortal friend, either, I think, because that would almost certainly break the rules of Crayak's game. And if their game is ever lost, they would be forced to go back to fighting for the universe again, destroying it in the process. Either that or start a new game, possibly even a worse one.
For the same reason, the Ellimist can't just go around and help everyone that he sees fit. He is bound by the rules of the game.
It might be fun, for a while. Yeah, you would be basically all-powerful. But then you might start to get attached to the races you were trying to help, because you have nothing else, and then one after the other they would each die (no species lives forever), and there'd be nothing you could do about it. I'd go insane from that. I think anybody would.