Okay so for upgrades how's this sound:

-Relentless: Ajax will chase you down and fight you, no matter where you go. He can now fight to the best of his abilities anywhere. The sky, deep underwater, the void of space, anywhere. He's able to ignore things such as lack of gravity and oxygen or magical effects of specific planes, anything that might render his attacks less effective, letting him operate under normal conditions.

-Perfect control: Ajax is able to perfectly exert and manipulate the force his body could produce at any time as long as he can move a single muscle, allowing him to create a large variety of kinetic attacks with even greater ease. Attacks done in this way still benefit from his ability to let his body affect things it shouldn't be able to.

-Immovable: By taking on a pose that tenses his every muscle, Ajax becomes anchored to a relative point in time and space. At the cost of sacrificing any manner of mobility and direct offense, Ajax becomes immovable and gains the ability to reflect attacks off his body.