Iyami presents himself as a flashy and mischievous individual claiming French heritage. He possesses three prominent buckteeth, a thin mustache, and a Beatles-style haircut. His speech is distinct, using "Me" (ミー, mii) for himself, "Chimi" (チミ) for others, and frequently ending sentences with "~zansu" (〜ザンス). Iyami is instantly recognizable by his signature pose: flexing his arms and legs while exclaiming "Sheeeh!" (シェー). This pose achieved widespread popularity, becoming a notable cultural trend across Japan.