Flight:The ability to fly by pushing his ki out of his feet.
Bunkai Teleport: Stemming mostly, if not completely, from his power to control reality, Janemba in his final form has the ability to fade backward while he's breaking into cubes, very similar to Instant Transmission, only he doesn't leave all at once. This ability actually pulls him through more portals much like Illusion Smash, it only looks like cubes. This is supported when Vegeta fires a blast at the space Janemba just left, but the blast hit him where he reappeared as if it traveled with him. InBudokai Tenkaichi 3, this power is replaced by Instant Transmission.
Cosmic Illusion A counterattack in which Janemba avoids the opponent's attack with the Bunkai Teleport and appears at their side to blast them away.
Regeneration: When Pikkon cursed Janemba, his body showed signs of cracking. However, Janemba seemed to able to reform his body, healing himself of the damage.
Telekinesis: He displayed this ability in his giant form. He used it to trap Goku within the colorful stones so he could perform Illusion Smash.
Copy Attack: When Goku started getting serious, Janemba held out his hand and teleported Goku to his hand but then quickly teleported him back so the Kamehameha hit Goku. After Janemba uses his Copy Attack, the subtitles has Goku stating that he is "...also a wizard".
Rapid Energy Cannon: After Goku transformed into a Super Saiyan 2, Janemba (while in his first form) uses this attack on Goku. He spins around to rapidly fire powerful, orangish-yellow spheres. Janemba spun so much that most of the ki blasts he shot at Goku formed into a huge nuke-like explosion, inflicting extreme damage.
Illusion Smash: While in his first form, the demon attacked Goku by punching into small portals big enough for his fists. By doing this, Janemba was able to hit Goku with a series of punches from a distance away. This attack was named in Budokai Tenkaichi 2
Reality Manipulation: An ability he carries through both forms, the demon can alter reality. For example, he changed the Other World station, with King Yemma in it, into a jellybean looking thing along with everything else in Other World, even the tournament grounds. Janemba's ability was enough to bring back the dead and allow all deceased villains to escape from Hell, and restore Vegeta's body. (When he encased the other world station, he in effect opened the gates between realms. Doing so allowed the living and dead to pass freely between the two realms. The ability itself didn't "bring back the dead").