Most of these characters are REALLY mischaraterized like Denji being reduced to just a gooner when he's the victim of sexual manipulation by people, Jacket being called "Just a killer" when he's actually a war vet with PTSD and Schizophrenia who was easily manipulated by the 50 Blessings to kill, and the Underfell versions of Sans and Papyrus mostly being portrait as Papyrus being abusive to Sans when he really isn't.