He is the last of his kind. Elimist was his game name not his given one (I can't remember his real one). Anyway, his people had a game where they had to go to a simulated planet and make some sort of major change on the planet using as little action as possible before their opponent. The transmissions of this game was picked up by an alien species who thought it was real, so they decided to come and kill the Elimist's people because they were "toying" with entire planets.
Whats left of his kind after that leave in a ship and look for a new world. Many years and planets later they find a small moon covered by water and go down to investigate. Elimist, who has become captain, and two others go down to the planet in a small ship. They end up being absorbed by a massive creature called "father" that covers almost the
whole planet and when the mothership comes down so does it and it's inhabitants, all thats left of the Elimist's people.
For years Father sustains Elimist, the only survivor, through tendrils that reach down into his body. During that time Father, who has over thousands maybe millions of years has absorbed many races and learned from them, playes "games" against Elimist telepathicly. Father would win everytime until they played a game called music and Elimist won. Once Elimist beat Father regularly Father stopped the games. So to make a long story short Elimist starts absorbing into his mind the people Father had absorbed until he contained in him everyone and Father was just a sponge. Elimist soon finds a small island where other ships have crashed over the years, so using the many scientists, engineers, and mechanics inside his head he creates a ship and intigrates his very body into the machine.
This is taking longer than I thought so I'm going to be real brief now. Elimist fights Crayak (you should know him) and gets sucked into a black hole, but instead of dying he gains the ability to control space, time, and essentially reality. Crayak soon learns of this and also gains this ability, and the entire Animorph series is THEIR GAME.
P.S. Elimist named the Andalites.