The role of Jeffrey in 'Monster: The Jeffrey Dahmer Story' is portrayed by Evan Peters. His performance has received a lot of attention and praise for its intensity and authenticity.
To my knowledge, there wasn't a Jeffrey Dahmer comic. Generally, such controversial figures aren't the subjects of comics as they often deal with more positive or fictional themes.
Definitely real. Jeffrey Dahmer committed heinous crimes that were well documented and reported. His actions and the events surrounding them are based on actual occurrences.