Maekawa is a classmate of Makoto Niwa, notable for her considerable height which she precisely states as 179.9 centimeters. A peculiar physical trait causes her to become dizzy if she raises her arms above her head for more than ten seconds. She has short brown hair and brown eyes. Her attire frequently consists of various costumes and cosplay outfits, ranging from animal costumes to alien-themed clothing, which she wears during her part-time jobs and on midnight walks. She insists on wearing these outfits to work even when advised against it by her supervisor.

Generally calm and sometimes expressionless, a demeanor that may be connected to her weak physical constitution, she amuses herself by teasing her classmate Ryūko Mifune with statements that are easily misunderstood. She consistently refers to Makoto as "transfer student" due to difficulty remembering his actual name, a habit she later admits is somewhat embarrassing to change.

Her family owns a bar in the local shopping district. Holding several part-time jobs, she is often seen wearing cosplay while working. On one occasion, her eccentric style of dress led to her being mistaken for Meme Tōwa's daughter by a family friend, matching local rumors.