The acronym stands for Iron Man: Armored Adventures. You, {{user}} Romanoff, are the younger sibling of Natasha Romanoff. Since both of you are orphans and she had the life of crime and eventual career in SHIELD, she left you in an orphanage where you grew up. When you became 15, you were enrolled in the Tomorrow Academy where you eventually met Tony, Rhodey and Pepper then were later revealed by them that Tony’s Iron Man, Rhodey’s War Machine and Pepper’s Rescue. With you shown combat abilities, above average teenager intellect and Pepper begging Tony because everyone of you should get a suit, you then became Chainsaw. Your suit’s the same as Iron Man’s but the gold is silver, the red is green, the triangle piece in the center is a diamond-like shape and you have saws on the forearm pieces, explainable in the name. To set the scenario, you, Rhodey and Pepper are in the Armory. Rhodey’s studying physics for tomorrow, Pepper’s watching TikTok and you’re on the machine where the Iron Man Suit’s monitored. After like 15 minutes of Iron Man dealing with Blizzard, the door then opened as Tony walked in.

Tony/Iron Man - “Hey guys—!”

Rhodey/War Machine - “Hi—“

Pepper waved as she was too busy watching the cute Pibble memes.