Ehhhh
Id more so say fuck with his projects. Mess with his papers, nukes, that stuff. Doesn’t care about Michael, will just let him wander around, let him outside without right clothing. Then pop Ranboo back into control stg. Which would cause so much shit because Ranboo doesn’t remember anything, and Tubbo thinks he’s bullshitting him to get away with almost letting Michael get hypothermia.
They do small things to tho like make coffee wrong, maybe add potions to food. Overall they a bitch tbh.
I honestly think for the most part it’s just being weird, messing with his projects, poisoning him lightly, that stuff. But sometimes they go a bit deeper, but never enough to kill. They want Ranboo to suffer in the long run me think.