Oculama

An escaped test subject from Scotland that seeks to surpass the concept of all evolution, making himself the true ultimate lifeform.

Wanted by several countries, he allied himself with the Dark Eclipse, a shadow organization that opposes the world government. Byron is grouped into the Deathspade Clan, Dark Eclipse's hired assassins, for his unique mimicry skills

How his adaptation works is that he can only adapt to three stimuli at a time, and any other sources of damage, he becomes deadly allergic/vulnerable to.
For example, after being hit by lightning, fire, and water attacks, he'll be totally immune to those; however, all forms of damage outside of those ones become extremely effective.
This allows Byron to switch in and out of many different adaptations as he pleases.

His body consists of nothing but fleshy tubes, which allows Byron to use his tubes to hide weapons or turn himself into a vortex cannon by absorbing air into his tubes