Judging from the comment on Aya's picture, the artist's "avatar" in this comic is probably Momiji. If the wall of text on the right gets a full trans, this can be confirmed or disproven.
I can't help but think of Freefall when I read "Doggy!"
DOGGY!wuffuriOption B - Amazing ShieldMeat~
Woof woof.WoofMouthSmileOption A - Huge SwordHas fangsWoof! Momiji
4-year-old girl
Refers to herself with "boku".
Tufty tail and fangs are her trademarks.
Training to be a great tengu?
Ayaya is her big sister.
Optimistic, slightly airheaded?
In a word...