U-E No. 13

U-E No. 13 (ウエノ13号 lit, Ueno Number 13) is a reoccurring minor character in Ueno-San wa Bukiyou. She is a robot created by Ueno in her image.

Appearance
U-E No. 13 is built from a caregiver bot. She is shown to have pick hair with red tips in the anime, though the shading of her hair in the manga suggests the reverse. This hair changes quite a bit, with different extensions rather than the twin-tails she starts with.

She will usually be wearing gym clothes.

Personality
No. 13 seems to be a copy of Ueno, without her inabition. She tries to confess to Tanaka for Ueno, but is stopped by Ueno. She also told Minamine that Ueno loves Tanaka when asked. No. 13 will do maintenance tasks for the school. Whether this is due to Ueno telling her, or of her own volition is yet to be established, though it's possible her base being a caregiver bot is responsible.

History
No. 13 is introduced as the invention of Chapter 9. She was created by Ueno to trick Tanaka into thinking the bot was her, but she becomes too affectionate and tries to ask Tanaka if he likes Ueno.

In Chapter 19, she is the source of the Science Room doppelganger. She is supposed to check out the specters with Yamashita, but she ends up cleaning up after her.

No. 13 tricks Ueno into falling on Tanaka in Chapter 29 during a balancing contest.

She plays baseball (VF89 invention) with the Science Club in Chapter 32. She helps Yamashita balance on the Repulsocks in Chapter 39. She is out mowing the school grounds in Chapter 48.

In Chapter 49, Minamine asks her about Tanaka. She eventually reveals that Ueno likes Tanaka to Minamine.

In Chapter 59 she helps cut the noodles from the Camisomen. Yamashita says her technique is perfect, but lacks the love that humans can put into such tasks. She doesn't understand how you can eat love. In Chapter 63 she is briefly seen grabbing Tanaka.

In Chapter 69, she tries to use wind to blow the Fanservo Pettibreaker up. Yamashita declares Ueno the winner, despite it removing her panties.

In Chapter 74, she serves as the judge in the trial of Mizuna for the crime of not wearing panties.

Trivia

 * U-E No. 13 appeared in every 10th chapter since her debut until Chapter 79, which did not feature her. She has only appeared in three other chapters, being 32 and briefly in 48 and 63.

Puns

 * Most of the inventions in the series have puns in their names. However, U-E No. 13 is a pun in English that was introduced by English translator Bainhardt