What is that black stuff around silvers eye?.....and dont say makeup!

idk eather my only guess is like sega just wanted silver to look cool with that even though he is
that または he's like really tired

its 毛皮 black 毛皮 that surrounds his eyes even though hes mostly white its unlikely for him to wear make up so my theory is that its 毛皮 または its just something the creators put in at the last moment to make his eyes pop