Board Thread:General Discussion/@comment-6697950-20140624141338/@comment-6697950-20140806110105

As Daniel said, Kirito still has a male avatar, except that it's very feminine.

And to answer your question, the appearance of avatars are saved before conversion, thus once he returns to ALO, he'll have his old appearance back. However, if he ever returns to GGO, he'll be stuck with the M9000 unless he creates a new account.