Katsuki was hit with a Quirk that spilt his different personality traits up. They all had their own hair color to tell them apart, they also had labels on their shirts;

Yellow: happiness.
Black: anger.
Blue: insecure.
Red: confidence.
Pink: flirtation.
Gray: smart.
Green: competitive.

Which one do you try talk to first?

//my prediction of what everyone is gonna say: PINKKKKKK