Powers and Stats
Tier: Low 2-C
Name: Alien X, his personalities include Bellicus, Serena, and Ben Tennyson
Origin: Ben 10
Age: Inapplicable (Was born in a realm that is out of sync with time, existed prior to Ben having his Omnitrix)
Powers and Abilities: Superhuman Physical Characteristics, Invulnerability, Flight, Reality Manipulation, Immortality (Types 1 and 3), Regeneration (High-Low), Time Manipulation, Telekinesis, Self-Duplication, Multiple Personalities, Spatial Manipulation
Attack Potency: Universe level+ (Effortlessly recreated a destroyed universe with a wave of his hand, Supposedly changed the art style for the Ben 10 series as a whole)
Speed: Massively FTL+ (Comparable to other Celestialsapiens, who easily cross interplanetary distances and can quickly grow to be as large as entire galaxies)
Lifting Strength: Unknown
Durability: Universe level+ (Took hits from Galactic Gladiator, another Celestialsapien who should not be much weaker then Alien X himself. Neither could one-shot the other)
Stamina: Unknown. Likely very high
Intelligence: Very high, but not useful in combat situations, as clash between multiple personalities prevents utilization of the intelligence. This isn't a weakness in Omniverse.
Weaknesses: Alien X needs to wait for the different personalities in his head to make a decision before he can do anything, though this weakness disappeared in Omniverse. Alien X can also have the powers absorbed by Osmosians, and needs to follow the Multiverse Preservation Act, or other members of its species will punish it. Alien X's Life-force might be absorbed by Anur Vladias.
Note: Please do not attempt to scale Alien X to the Chronosapien Time Bomb. Not only was Atomic X unable to stop it, it would be nonsensical for Ben 10,000 to utilize an alien that is infinitely weaker to stop a multiversal weapon.