The brother of his female counterpart, Mr. Fanservice provides similar eye candy for women and gay men. It can be an effective way to bring in female viewers, even in a series directed towards males.
In order for a guy to qualify as Mr Fanservice, just being attractive isn't enough. He needs to be shown in scenes intended as fanservice for girls (and certain guys). He can have anything between muscular limbs, broad shoulders and/or sculpted abs (between six-packs and eight-packs). Said muscles can be either lean or chiseled; as long as you can see them, they count. He may also have long hair though it's not required. Most of the time, he has medium length hair, a swimmer's build, a smooth chiselled chest, washboard abs and no shirt on. However, if he's wearing a shirt, it's usually sleeveless or left totally unbuttoned.
He needs to be subjected to at least one Shirtless Scene, or he can take it a step further by deciding to forgo a shirt all the time. In the Beach Episode his choice of swimwear is likely to be a speedo. Just like his aforementioned counterpart, he can wear tight clothing, which shows off his body without baring skin. He can pull off a male version of Bare Your Midriff. He can wear anything (or nothing, that works too), as long as these clothes accentuate or reveal his muscles. If he wears some sort of skirt like garment the female fans will be prone to ask if he wears anything underneath it. He can also gender flip the Reluctant Fanservice Girl, Shameless Fanservice Girl and Innocent Fanservice Girl tropes.
An especially easy way to show off his figure would be through the Workout Fanservice, where he flexes his muscles via exercising. Hot Men At Work is when the Mr Fanservice is, well, at work, but distinctly lacking a shirt, regardless of health and safety issues. Bonus points if he's The Charmer.
It should be noted that the trope is not necessarily restricted to Hunk type characters either. Bishōnen and pretty boys can easily qualify as well, and are often intended as fanservice too (particularly in manga and anime, where they are rather common and video games, where they are not as common with some notable exceptions). A rarer type of the pretty boy subseries is the Biseinen who has a pretty face and chiseled muscles rather than being willowy. Biseinen are often unemotional but can still appear in comedic situations which can overlap with the genderflipped Reluctant Fanservice Girl.
Examples with their own subpages:
- Anime and Manga
- Comic Books
- Films — Animation
- Films — Live-Action
- Live-Action TV
- Pro Wrestling
- Tabletop Games
- Video Games
- Web Comics
- Web Original
- Western Animation