"moved" to @belyartsさんのイラストまとめ
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And not just him, actually. His (almost) full black sprite is similar to V19 for one reason. Both of them are powerful characters that carries mystery and malice in their development, that's why they have almost the same sprites.
When we talk about mystery and unknown, we come to the most mysterious character in the games: Seth Eyler/UM, which color palette matches Charles, but has different meanings.
UM can be associated with the interpretation of the color black that, too matches power and evil.
Ink, in HC, is associated with corruption and consequentially, death. Charlotte, due to the Oracle in her head, gets the Ink Cough.
It kinda relates a little to assotiation with black. And since black is a color that absorbs all light, the association with ink is direct.
Even if UM and Charles are most associated with black, yellow can be predominant to them too. Since both of them are observers in the game. A bright yellow can be associated with "warning" and "alert" which explains why every character possessed by them gets a yellow eye color.
