Jason only wore the pixie boots for a short amount of time, and never met Kara til he was redhood an dick taught Kara when he was nightwing, but it would only make sense that it was Tim if he was wearing pants. My guess is Dick though.
WE HAVE TELEPATHY!!! I was literalyl just thinking "man I wish bridget would draw more super heroes..." AND THEN BAM THERE THEY ARE!!!! WOHOOOOO!!!! YAY!!! Great work they look amazing you should be a comic book artist!