Aska

A design of Aska when she'd be interacting with the turtles.

The Footbots are just Utrom suits and are part of the Foot Clan's defense for the Utroms living on Earth. She was part of a party trying to capture the turtles, who assumed the Footbots were "just machines". Until Raphael slashed through one of them with a knife (having lost his sai in the fight) and drew blood. Or Leonardo; from a writing point, I think Raphael would be more appropriate; Leonardo would consider injuring a foe to be part of the job, but Raphael would be a little more torn up about it.

Aska's injury was not life-threatening, but serious enough that it left a scar.