Colors {Tododeku}

When you turn 7 you get a string only you can see that flashes colors to represent the mood of your soul mate when in pain it flashes red

Izuku "Deku" Midoriya has always had a blue, purple or flashing red string but halfway through his first year of middle school green was added

Shoto Todoroki has had for most of his life head a blue, purple and red flashing string but around high school his string had less blue and purple and flashing red and had more green