HMX-12 Multi (マルチ Maruchi^?) is a robot created by Kurusugawa Electronics and arguably one of the most iconic characters in To Heart.

Multi has short green hair and emerald green eyes. Her large robotic 'ears' enable her to be distinguished as a robot. She wears the school uniform most of the time.

HMX-12 Multi (マルチ, Maruchi) is a fictional character in Leaf's and Aquaplus' visual novel To Heart. In the visual novel, she is an experimental maid robot, and she made her first appearance as one of the game's ten female main characters. Multi was created by writer Tatsuya Takahashi, who wrote her scenario for the visual novel, and designed by illustrator Tōru Minazuki. She is voiced in Japanese by Yui Horie and by Tara Sands in the English version of the 1999 anime.

Multi was the second heroine in To Heart to be created by writer Tatsuya Takahashi and illustrator Tōru Minazuki, after the pair had created Aoi Matsubara.^[1] Takahashi recalled that he thought the development team would react surprised when he declared he would make one of the heroines a robot, but he instead received calm responses.^[1] Minazuki held no objections because he thought a robot character would allow the pair more creative freedom, and thought Multi's innocent personality would be fitting for a robot character.^[1] Takahashi also stated that as a robot, Multi in turn made the magus Serika Kurusugawa and esper Kotone Himekawa acceptable characters for the story. In an interview, Takahashi noted that he initially had difficulty creating contrast between Multi's, Aoi's, and Akari Kamigishi's personalities, but said their personalities eventually diverged, and Multi ended up as having an "earnestly pure" personality.

In the visual novel, Multi is first mentioned in a conversation among Shiho Nagaoka, Masashi Satō, and Hiroyuki Fujita, when the three discuss the school's recent admittance of a maid robot. Hiroyuki later meets Multi, when he saves her from falling down the stairs. Hiroyuki then learns that Multi is a prototype robot undergoing a test run at the school, and the two soon become friends. Throughout the next week, Hiroyuki regularly chats with Multi as she cleans the school's corridors, and often helps her when she becomes troubled by an unfamiliar situation.

After Multi finishes her eight-day testing period, she asks Hiroyuki to give her the chance to repay the favor; she is taken by Hiroyuki to an amusement park for a date. While the couple rides the park's ferris wheel attraction, Multi reveals that her memories will be reset after the testing period is over, and that the data she gathered during the test run will be reused in the mass-produced model. Multi confesses her love to Hiroyuki, and willingly returns to her laboratory after Hiroyuki buys her a straw hat and promises her to purchase a mass-produced model. Later, Hiroyuki meets Gengorō Nagase, Multi's designer, who discusses his opinions about robots with Hiroyuki.

The following year, Hiroyuki and Akari begins to attend university. Remembering his promise with Multi, Hiroyuki buys a mass-produced variant of Multi, but finds that Multi's emotional functionality has been removed as a result of cost reduction. Hiroyuki eventually receives a letter from Nagase, who informs him that the Multi he bought had been used as a test model in his high school. Hiroyuki also receives Multi's straw hat and a DVD that contains her previous data, which Hiroyuki uses to recover Multi's memories. Multi wakes up with her memories and emotions intact, and reaffirms her love to Hiroyuki.

Multi is a cheerful and high spirited robot girl who desires to act just like a human. She was sent to Fujita's school in order to achieve this.

Cooking, Cleaning, Being of Help to People