A fan variant of Ashley Graham circa Resident Evil 4, specifically the remake. Also known as Moushley or Mousley.
The variant came from Twitter user Agrimmora's drawing about a version of RE4 where everything was exactly the same except Ashley was now a small white mouse, itself a gag on the original and remake Ashley's bigger-than-average ears. She retains all of her regular clothing and role in the story regardless.
This tag implicates ashley_graham (learn more).