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, Size Manipulation (Other Celestialsapiens can easily grow large enough to dwarf planets), Flight (Easily flies across interplanetary distances), Reality Warping (Easily recreated the universe with a simple thought), Immortality (Types 1 and 3), Regeneration (High-Low), Telekinesis (Moved and threw the Amalgam Kids with Telekinesis), Self-Duplication (Created many copies of himself in his fight against Galactic Gladiator), Multiple Personalities (In order for Alien X to perform any action, including simple movement and transforming back, all three of his personalities must agree to do so. His personalities include Serena, the 'voice of love and compassion', Bellicus, the 'voice of rage and aggression' and Ben Tennyson, the 'voice of reason'), Space-Time Manipulation (Serena stated that Alien X can change the very nature of time and space), Mind Control (Controlled the Amalgam Kids' minds to fight against each other), Pocket Reality Manipulation (Serena, Bellicus and Ben Tennyson hold absolute control inside Alien X's body, which is a pocket universe that contains many galaxies)
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
Standard Equipment: None notable
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.