From Kenta's creator MidZM on Kenta's powers:
Kenta doesn't really have powers perse, but gracie gives him his dual "stinger" swords, the AOG, and enhances his speed slightly.
The AOG's in Marked are Type specific with certain strengths and weaknesses given to the armor, Kenta's armor is Defense and Power based meaning his defense capabilities are higher than normal and, even at his low version level, can hit hard. That does mean his speed isn't as fast as a Speed type armor, but he does still get a slight speed increase just from having the armor.
Kenta's armor being V1 means when he flies it uses fire acceleration instead of gravitational manipulation. it's less powerful and controllable, but the flames can be used as a weapon if the need arises.
Finally there is "the darkness", a latent evil that had been asleep within Kenta since he witnessed his mothers murder. The darkness boosts Kenta's strength, speed, and pain tolerance 5 fold, the downside is if he uses "the darkness" to many times or for an extended period of time he will lose complete control of his body to the evil entity. If the entity escapes it will destroy everything in it's way with abandon.