Animesexual is a term under the Asexual umbrella (Animesexual can also be under the Fictosexual umbrella) in which an individual experiences little to no attraction to anyone, but rather fictional characters. Animesexuals are specifically attracted to anime characters. Usually these attractions are far stronger than typical fictional/celebrity crushes that are akin to the attractions an Allosexual (someone who is not Asexual) would feel for another person.
Animesexual individuals are more frequently attracted to anime/manga characters than they are to individuals in real life.
This label has been known to cause some controversy because some feel that is making a mockery of the LGBTQIA+ community, when in reality it falls under the Asexual umbrella.