"Five-Elemental Based Ability Mimicry is the ability to mimic other abilities in relation to the elements (water, air, earth, fire, lightning) attributed to them. This ability lets one copy another ability after seeing it, but the copied ability must have an elemental type that corresponds to an empty elemental spot or would be able to replace the old ability that was in an elemental spot. If an ability has two or more elements, when coping that ability, it can go to any of the elements that it is comprised of. (ex. Atomokinesis has both Air - movement - and Earth - solid - attributes)." So if he wanted to copy Atomokinesis, he would have to replace telekinesis - air - or telephasing - earth.
So far, he has seen many abilities but currently has Telekinesis, Telepathy, Telephasing, Energy Manipulation, Phoenixian Mimicry. He has also exhibited healing, atomokinesis, technopathy, elemental manipulation, and lumokinesis. His Claircognizance also seems useful to his understanding of his and other abilities.
The Company tried to lock him, Sophia, and Maria up in 2005 but every agent who came their way had their memories of the three erased via Sophia's telepathy. Though Senna had telepathy at that time, he was under a personal vow to not use mimicked powers. When Pinehearst tried to recruit the trio, they where willing to join up at first. However, while they were discussing it, Senna used his Claircognizance to find out that they were trying to save the world through mass production of synthetic powers. He then analyzed what would happen in the near future. Though it drained him of all his energy, Senna was able to pull out that Pinehearst had to be stopped, and would be eventually stopped by one with a power negation ability, a regular human, and the infamous Sylar. With that knowledge, Senna set Maury Parkman packing saying that his son was going to be in danger if he didn't do anything. And with that, Senna let Pinehearst come to its inevitable end.
Senna also is the leader of the Evolved Human Faction, the Phoenix Alliance. An organization dedicated to uniting and training evolved humans all for the purpose to save the world.