This is the chubby protagonist (a.k.a. Protagonist 5, MC5) from Housamo.

Trigger word is protagonist5, housamo

Prompts for anatomy (human version):

mc5, 1boy, solo, male focus, short hair, spiky hair, dark brown hair, messy hair, chubby face, round cheeks, soft jawline, wide eyes, dark eyebrows, black eyes, chubby

Clothing:

school uniform, gakuran, black uniform, gold buttons, closed collar, long sleeves, black loafers,

or

white t-shirt, black shorts,

Optional:

blue pentagram tattoo, sword, holding sword, standing pose, full body

Prompts for Future Hero - cthulhu:

future-hero, cthulhu, 1boy, solo, male focus, short hair, spiky hair, dark brown hair,purple hair, two-tone hair, messy hair, chubby face, round cheeks, soft jawline, wide eyes, dark eyebrows, black sclera, red iris, purple goo clothing, spiky purple tentacles, purple aura