Strictly speaking, a person who seeks romantic relations with Asians.

Cmmmonly, a short or scrawny white male lacking self-esteem and/or assertiveness who seeks power in interpersonal relationships by attempting to date Asian females whom he perceives to be submissive and obedient.

Also, a white male with a prurient but ironically inaccurate fascination with what he perceives as exotic.

Someone who like Asian culture and Asian people.