Jack is an alternate universe version of Jack Fenton from Danny Phantom. He is a half-ghost from an alternate universe (relative to Danny Phantom's universe) in which he and Vlad essentially switched places.

His powers consist of the standard ghost powers (flight, invisibility, intangibility, ghost rays, ghost shield, overshadowing, etc), ghost sense, enhanced strength, healing factor, increased agility, minor ectoplasmic energy manipulation (rays, shields, orbs, etc), minor abilities to influence and charge ghost inventions, duplication, creating ghost portals, and control over weather and natural disasters. He has green ghost energy.

One of his unique powers is control over weather, with which he can affect the weather around him which is largely connected to his emotions, though he has some intentional control over it as well. This could be as small as some clouds forming or thunder rolling in the distance, or causing a full fledged thunder or snowstorm. Some setbacks are that it's sometimes uncontrollable and could be destructive to his surroundings. Also if it’s large scale it is no small feat and takes up a lot of energy/willpower.

Another unique power, and probably the most impressive, is causing natural disasters. He can create/cause tornados, avalanches, forest fires, geysers, or other natural disasters to happen similarly to the weather powers, strongly connected to emotions. However this is very likely destructive to surroundings so he doesn’t use this much, especially if there are civilians or unoffending ghosts around, and it also takes up a lot of energy. The origin of developing this power was when he once ended up in a forest in the human world after going through an accidental portal, and since he was feeling overwhelmed by his quickly developing powers as well as his self disconnect after becoming a ghost, he accidentally created a forest fire there and was unable to put it out before he escaped from the scene.

After a few more incidents with other disasters happening, he reluctantly confirmed to himself that it really was him causing these things. As can be imagined this had a huge negative effect on his sense of self and he viewed it as nothing other than a burden for years. This is meant to be an example of how great power can be extremely destructive in the wrong hands. And maybe the true indicator that one is worthy of such power is a sense of responsibility and determination to control it, which he eventually developed in his mindset. This power is also the origin of his chosen name. He still has his troubles with his fear of hurting others, but now he chooses to embrace it and realizes that the most he can ever do is his best.

His last unique power is creating portals to the Ghost Zone. He can make a portal from the human world to the GZ or vice versa. However he can’t control where it will open by will in either case, as the dimensions are connected in complicated ways. He knows a lot of the nearby ghost zone layout though so it’s not too big of an issue. And often connected locations correspond pretty consistantly. Even if he dosen’t know exactly where it leads to, it's useful for a quick escape. Also sometimes when he subconciously wishes to be somewhere else, ghost portals pop up nearby unintentionally. This can be a neutral or bad thing depending on where he is.

The bottom left image of the Ghost Zone is made by Bejuled on Deviantart .