I would like to have the power of Nulls and Voids, i.e., the ability to create voids in matter, such as creating a hole in a wall (or person), and, more esoterically, gaps in the fabric of reality and space-time, essentially allowing me to teleport and time travel, as well as the ability to nullify or negate things, like undoing a previous action, such as the creation of a void, or even negating a person's autonomic or higher brain functions, or any abilities, super or otherwise, which they might have...
...but, since you stipulated that such powers would be based on one's personality, I'd probably say that I would get some kind of Entropic Force which allows me to kill and destroy things (including people) with my hate and contempt. That would be immensely satisfying, especially if I could vary the means or form in which it occurs. Don't get me wrong, causing people to explode with my mind would be a lot of fun, messy, but fun. Sometimes, however, simple disintegration or non-existence is all that is required. I like versatility.
I've already got a watered-down version of Wolverine's abilities, i.e., amazingly strong bones, berserker rage, extraordinary senses, great fortitude, resistance to illness, and semi-regenerative healing. I'd just really like the whole Nulls and Voids thing.
I also seem to have a talent for noticing things and reading people, so an enhanced, "super" version of that ability would be useful, enabling me to find the flaws in an object's makeup or a person's character, allowing me to better fulfill my role as judge, jury, and executioner.
Of course, I'd use my powers for the betterment of society...in a manner similar to The Punisher.