Actually, I think the length is about right. Most TMNT artwork draws them too long for Leo. The ninja's katana would have been shorter for fighting in close quarters (many sources I've read suggest the ninja "katana" was a wakizashi in a katana's scabbard to give a misleading judgment of draw speed) .
Its true , but the handles are still small , especially the handle guard (square shape) , just like in mikey and raphs weapon aswell , they look kinda small for their hands .