He may be centered around stealth- I've come up with some powers.
1. Teleporting self, others, and objects through portals.
Weakness for that: He needs to have seen the place the portal leads previously for it to work.
2. Invisibility
Weakness for that: If he stays invisible for 60 minutes or more, it gets harder and harder for him to turn back until he cannot.
3.Side Power: Immediate Clairvoyance: He can see the future of himself- but only a few seconds into the future. This is a useful skill in combat.
Weakness for that: He needs to devote his energy to seeing the future, which leaves him prone to attacks as he can only see a few seconds into the future and can be attacked while seeing, or after an attack he saw in the future.
4. Telekinesis: He can move objects. That's the definition of telekinesis.
Weakness for that: He needs to concentrate on the object he is moving; and he loses focus easily.
5. Phasing: He can phase through most surfaces, except some. (e.g. Vibranium, if he was in the Marvel universe)
Weakness for that: He needs to focus on his phasing, or he gets stuck in the surfaces he's phasing through- which is a messy sight.