Ultranova
Basically the guardians are a group of 7 who used to keep balance in a small galaxy (a long time ago almost 15 thousand years ago) so it would keep going and not be dominated by one faction because some inter dimensional gods wanted to watch galactic TV. To do this they effectively gave them super powers and then another set of superpowers in form a unique gem these consist of stuff from instant teleportation anywhere being able to grant wishes for an equivalent cost or ridiculous psychic powers. At some point they ended up in the cosmoteer galaxy but because they have been out of action for so long they have all been nerfed in some way they can get their full powers back but it will take a while.