(Warnings: Corpses. Mentions of killing, character death, shattered/broken minds, and manipulation, not explained in detail)
Since ♦️ & ♣️ are mostly together throughout being immortal together, they absolutely despise each other because of what the other doesn't want to do. ♣️ didn't want to do what he's being forced to do, killing and barely being able to warn others since he's so shattered and broken. ♦️ is the opposite of what ♣️ is feeling, being the one who manipulated him in the first place and dragging him into all sort of insane and uncanny things and is also fine with the smell of rotting corpses. (Note: No one knows why exactly ♦️ does like the sight-or weirdly, the smell-of rotting things in general.)
More information later on!
(Should I make a book about what their personalities are? Please let me know!)