Ultimo

"Anthony Edward Stark. Please do not think that I fail to recognize my creator." "I'm...flattered?" "As you created me, so shall I destroy you!" "I screwed up, okay? I made mistakes. Sick men like DeWitt took my mistake and warped you into something. Something monstrous. But you, you grew, you learned, you amazed us all! Don't make me have to kill you. You're my responsibility." "Yes. You are responsible and you must pay!"

- Ultimo and Iron Man

Ultimo was a large battle suit worn (and fused with physically and mentally) by Kearson DeWitt.

Biography
Ultimo was created by stealing and modifying an old A.I. version of J.A.R.V.I.S. and a project he was working on at Stark Industries, PROTEAN. Iron Man finally confronted the giant Ultimo and War Machine fought him while Iron Man fought the Kearson/Ultimo within. After removing the other Arc Reactors, War Machine and S.H.I.E.L.D. continued to attack while Iron Man fought the Kearson/Ultimo.

In the end, Ultimo was destroyed when Nick Fury rammed it with the S.H.I.E.L.D. Helicarrier.