By op I mean not giving your character every power under the sun or giving them a ludicrously powerful ability. On that note the number of powers kinda depends on how powerful your other powers are. I guess the best way to regulate this is to just create an OC then I would take a look and give suggestions (if I have any) to nerf an op character. This also kinda goes the other way to ie. if your character is a little under powered compared to other characters I allow then I will tell you that you can add to their powers (in whatever way you want as long as it doesn't get so powerful it becomes op) so that everyone is somewhat on equal footing.