Board Thread:Questions and Answers/@comment-38159116-20190114202101/@comment-34263048-20190114203045

Alps are Incubi that, deep within their heart, strongly desired to become a woman or be with a man.

Incubi's are men who have spent a LONG time with mamono.

Therefore I'd say no, there is not a single alp variant, as it is it's own monster, a man who has become a female.