While the very concept of a supervillain in and of itself might be unnerving, the realm of pop culture is replete with nefarious figures who don't exactly exude an air of horror. That being said, there are plenty of supervillains who have made a career out of how terrifying they can be, and the Marvel Universe is in no short supply of them.
Source:https://www.cbr.com/marvel-supervillains-scary-ranked/