Maybe. It really depends on the situation. For example, one of my characters was going to have flying and super-strength. Those can each be their own superpower, but they wouldn't be out of place together, so I would allow it. But if you wanted to have something like animal mind control and pyrokenisis together, I would have to make you pick one or the other because those powers are two radically different ball games. What did you have in mind?
ok, forget the forbidden magic stuff question because after thinking about for a bit, I decided it was stupid and pointless.
As for the other, that's understandable. It's not gonna be anything outrageous or anything, but I just wanted to make sure. Is a character with umbrakinesis and cerebrokinesis acceptable? And to try to make them not too powerful, I can say the cerebrokinesis can only be used through eye contact and/or touch?
There aren't any stupid ideas in Super OOC. Only illegal ones.

Cerebrokinesis is definitely not allowed, period. It's a fancy word for the mind control that I completely banned.
As for umbrakinesis, most of the powers under it seem to be good in theory, but there are a few concerns I have with the power as a whole:
-Shadow travel would definitely be banned or heavily nerfed, as it violates the ordinance on teleportation.
-The seeming invulnerability of the shadow/dark energy barriers might be an issue. We can resolve this easily by putting an easy to understand limit (eg "can block a cruise missile but not a nuke", etc.).
-Character control and manipulation via shadow is a no-no, unless it's indirect psychological manipulation of someone who is afraid of the dark. Direct control is out of the question.
-What does it mean when it says "can absorb shadows"? That sounds like it might violate the rule on arbitrary energy absorption/dispersion.
-Does night count as a giant shadow? If so, that might be an issue.
-Several of the aspects of umbrakinesis would have to be split into separate powers. For example, you could make shields and weapons from shadow, or you could produce shadow to make your enemies blind and yourself invisible, but not both. Healing would also have to be a separate power.