While Ralsei's parents are complete jerks for abondining him, Dimentio's parents (Blumiere and Timpani) both betrayed him... But unlike Ralsei's parents they do love him. But Dimentio doesn't believe in their love. So, by being kind to a child who got abondend by his parents(Ralsei), Dimentio feels like he is getting his revenge on his parents.
(I edited this with photo with the art I found on the internet and wrote the dialogue according to my headcanon.)
I wanted this to be a SPM x Deltarune x Undertale style thing.
Tell me if you want want more edits like this...
Sources:
Background (Ralsei's Castle): Deltarune by Toby Fox
Ralsei magnet: @utgoing
Dimentio sprite: Super Paper Mario by Nintendo and Intelligent System
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