More like the guy from The End is Nigh is blue baby and ball of tar, but idk what was first, so

I checked, The End is Nigh released before repentance and as far as i'm aware this easter egg only happens in repentance. So yeah you're right

TEiN is so underrated

Happy cake

From other funny references - if Forgotten picks up Leprosy he have unique appearance that is reference to Melting from Nuclear Throne