Origin
It is unknown what mutant powers Jonadab Megyscol was born with, but he was later revealed to posses some. He was a member of the Anti-Registration Underground and it is unknown as to whether or not he was arrested by S.H.I.E.L.D. when they discovered the location of the underground. He lost his mutant powers during the Decimation.
Creation
Johnny Justice was created by Paul Jenkins and Ramon Bachs, with his first (and only) appearance being in Civil War: Front Line #4 – Embedded, Part 4.
Powers and Abilites
It is unknown what mutant powers Megyscol was born with, but it was revealed that he (like many other mutants) lost his abilities during the Decimation.