Headcanons (Koi)
I'm just going to put all the headcanons I've recieved into one giant literature for Koi
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physics
There's not too much to go off, so I hope this one is fine!
Perhaps they dye the streak of hair blue to emulate a character they're really fond of who has blue hair. They'd like to dye all their hair blue, but they're not quite brave enough to try that bold look out yet.