I don’t care about Ruin very much, so I don’t make a ton of headcanons for him, but I do have a couple that I haven’t written down.
(TW for transphobia and mentions of SA)
Ruin’s faceplate is made out of porcelain. I have talked about that before but I wanted to bring it back because I like it.
Ruin is so used to being underneath everyone else that he reflexively addresses people as “Sir” or “Mistress”. He used it sarcastically with Eclipse because it annoyed him and sincerely with Puppet because she was powerful. When he was working with Nexus, he purposefully only referred to her with a “highness” or “mistress” because it appealed to her ego without having to respect her name change.
Ruin generally has this “servant who lives in the Nice Quarters because he fucks the king” vibe to him. He hates getting his clothes dirty, hates doing any sort of labor for other people except romantic or sexual favors. When he worked with Bloodmoon, he’d always hand off all the physical labor to them while keeping all the easy work for himself.
Ruin is actually a sadist, not a masochist. He only acted that way to gross Moon and Bloodmoon out into not hurting him.
Ruin made Bloodmoon to be attractive to him, and gave them the shocking command knowing that he’d be into it. He preyed on Bloodmoon extensively throughout their partnership.
Ruin is transphobic. He calls Cosmos Lunar and Nexus Moon, when he can get away with it. He’s had like 3 canon interactions where he reacts poorly to either a name change or a new body (that being when he meets Cosmos after they become neighbors and says to Tiger “His name is Lunar.” after Cosmos already explained Their new name, Nexus when she made her new body and Ruin responded with “What did you do to yourself?”, and Molly in the TEAPS dimension, where he generally just made a grossed out noise when he saw her.) He’s definitely transphobic.
