Metatron is the leader of the Archangels in some branches of Judaism and Christianity.
His primary weapon is his arm-mounted fusion cannon, capable of levelling a city block in one blast, which he can sub-dimensionally link to a black hole, generating even more powerful antimatter blasts. He has a secondary weapon barrel mounted on his back, and can retract and replace his right hand with an energy mace.
He is able to transform into Enoch, some dude from the Bible. Some crystal-fondling hippie freaks believe he lived for 300-odd years and then "transformed" into Metatron, skipping the age old process we like to call death.
Enoch invented books and writing, and as such, is the King of All Nerds. He began our descent into librarianism and litrocracy, and founded the secret leftist society of the Literati.
Metatron's Cube, contains 30 "nodes"(or in layman's terms, circles), looks cool, and his soul gives birth to it.
During the epic Hydrothermaclin battle, Metatron imprisoned Optimus Prime in this cube, and gained control of the Hydrothermaclin generator.
Though his primary function is to analyze, record and store data, Metatron is by no means weak in the ways of war. However, at this time, we cannot describe any of his epic conflicts without it coming across as bad fan fiction.