Meh because of yuuki_rito genderswap_(mtf) (which all Yuusaki Riko posts should be tagged as anyway and are not).
If my recollection of the anime doesn't evade me, Yuusaki Riko is not significantly different from Yuuki Rito. Calling Yuusaki Riko an alter ego of Yuuki Rito is wrong because he doesn't undergo a significant personality change, change of spirit or anything of the sort that would realistically separate them as characters, nor do they exist independently.
Yuusaki Riko is at most a pseudonym. Rito is still very much aware of his changed body and is still himself but just passes off as a woman in social circumstances to appear as a different person. They aren't actually different.
IMHO should be mass updated to yuuki_rito genderswap_(mtf) -yuusaki_riko then nuked. The meh is because there's potential precedent, alternate forms as separate chartags, search utility, and because I'm not going to pretend I know what's best for the chartag.