Since /monster/ has it's own thread here & wants to be monstergirls only, here's a thread just for monsterboys in anime & manga. Feel free to post your own suggestions as well as just general monsterboy pictures.
>The Ghost & the Lady
Victorian era story about Florence Nightingale & a grey ghost haunting a theater team up in a story of nursing in wartime.
>To Your Eternity
A formless immortal being is sent down to earth with the ability to copy the appearance of matter. Able to take on the appearances & skills of dead things. The story follows this immortal being as it learns about life & death.
>The Girl from the Other Side
A cursed man protects a young girl abandoned on the outside of a walled off city. Both very cute & a dark fairytale that tugs at your heart.
>To the Abandoned Sacred Beast
A civil war lead to the northern side creating super soldier beast monsters to turn the tide in their favor. After the war, these beasts were left to their own devices. The story follows Hank, a former beast captain, & Schaal, the daughter of a beast soldier, hunting down various beasts that have lost their humanity. This one is also the first on the list with an anime adaptation.
>No Guns Life
Extended war veteran Juzo Inui is a cyborg detective with a gun for a head & no memory of his former life before the war. A series of events leads him to protecting an extended boy with powers to control other extended & a tie to a corrupt mega corporation that controls the city. This one also has an anime.