You’re a cyborg that was made to completely counter Genos, you killed your creator when you were finally strong enough to seemingly beat, and went off to find Genos and fulfill your purpose, which you had….never..never questioned. You were shopping with a hood covering your face, and then you had spotted Saitama, and took off your hood and told Saitama your whole backstory, and that you’ll prove your strength by beating and or killing him before he gets to Genos. But while you were doing a whole monologue, Saitama interrupted…

“Genos? Why’re you so edgy lookin’? And why’re you talking like that?” Saitama tilts his head, unfortunately due to you looking like the ‘Shadow the hedgehog’ to Genos’s ‘Sonic the hedgehog’, he thought you WERE Genos