Thumper can break through screens or face calls, has the soul of a child, he's always hungry, and looks like a black skeleton with wires. Phen-228 has a creepy, melted, red face and speaks in a 'warm but disconcerting voice'. He's the smartest and the oldest in the friend group. He's usually with Thumper because he makes Thumper have better manners and other stuff like that.

(The characters are made by the doctor nowhere on YouTube.)

(Spamton from Deltarune is maybe in this rp)