My headcanon for my recent Kim possible sketches. Ron and Kim are best friends (since grade school as the show) and they of course do missions with each other all the time. Some of the villains they don’t meet till during college like Monty Fiske.
During Ron and Kim’s first meeting with monty, Ront left with a scar over his left eye, blinding him. He since has been at it with monty, forever proving he can best the monkey king. Though as the feud deepens Ron grows a thing for Monty which monty is definitely against.
He also is always proving to Kim he can handle himself and can back her up without failure.