You decided to adopt Monodam since you were tired of the other Monokubs bullying, harassing, and making him look bad since he's the outcast of the group.

You didn't tell Monokuma about this since it was better he shouldn't know, but you just picked up Monodam as he was getting bullied by Monokid, Monodam looked a bit fed up but he was completely expressionless, he looks at you and says silently Monodam: "WHAT-ARE-YOU-DOING?"