fanboy

A male fan who is obsessive about a particular subject (especially, something or someone in popular entertainment media).

(It's in the nature of comic book fanboy obsessiveness that all of these Eras and Ages and such have been religiously chronicled; it's equally in their nature that no two fanboys can ever agree about anything about any of these Ages and Eras; everything is up for debate, eternally and in microscopic detail.)

Six years and seven titles later, their company, Top Cow, is the third-biggest-grossing comic line, thanks mainly to a pair of blood-soaked, modern-day Gothics that have been a hit both with fanboys and a growing number of women.

To worship, support, drool over the object of affection; to be a fanboy.

James has a tendency to fanboy when something he likes is done wrong.

2019, Ocean Vuong, On Earth We’re Briefly Gorgeous, New York: Penguin, [Acknowledgements], To Yusef Komunyakaa, thank you for […] tolerating my fanboying when, by luck, I sat down beside you one rainy night in a West Village theater […] and kept yapping about everything and nothing at all.