AnAkko

Ankko is the het ship between Andrew Hanbridge and Akko Kagari from the Little Witch Academia fandom.

Canon
When they originally met Andrew was very annoyed with Akko's antics. Especially since she accidently gave him donkey ears and a tail. He also didn't like the fact that she was a witch however he later grows fond of her. While they were hanging off of a ledge Akko accidently starts to pull his pants down and at the sight of his underwear she blushes furiously and is about to fall down. Until Andrew tells her that it's just annoying and not to worry about it.

Akko is originally annoyed by Andrew's views on magic. As he thinks that it's useless in the modern world. But after a long conversation near a fountain Andrew changes his opinions and thanks her for explaining to to him. Much to Akko's surprise since he's normally stubborn. But when it comes to Akko he's more open to the idea of seeing things from a different perspective.

In the episode "Bee Commotion" Andrew compliments her saying that anyone can look good with the right clothes. Akko doesn't know if it's a compliment or insult but since it's Andrew he likely meant to compliment her. Later on Akko is extremely flustered and embarrassed when Andrew pings her to a wall and starts flirting with her due to 'Cupid Bee's' influence. As her face turns a bright red she runs away and undoes the influence. Later on Andrew either pretends not to remember or truly does not remember when she brings it up.

The two seemingly grow closer throughout the series. When Andrew returns Akko's hat she thanks him and starts making jokes as he starts laughing. Which is the first time we've ever seen him laugh in the series. As Akko giggles along with him.

Andrew inspired Akko to be her own witch rather then following in Chariot's footsteps. Which makes Akko come to a realization that Andrew truly does care about her but he shows it in his own special way.

At the end of the series as Akko is flying on her own Andrew is shown sitting there with all of her other friends smiling at her fondly.

Fanon
Most fans started shipping the two due to their cute interactions and how they improved their relationship throughout the series. The fact that Akko is the only one to make Andrew smile made a lot of fans start shipping them.

Another contributing factor is that the two broke through to each other. Akko broke through to him by making him a kinder person and changing his negative view on witches. And Andrew broke through to her by telling her that she's great in her own way and doesn't need to be like her idol.

However it loses popularity to Diakko. But some people prefer this ship due to the fact that they had a lot of development and had tons of ship tease. It is the 2nd most popular ship for Akko and the most popular for Andrew.

Trivia

 * According to an interview with Yoshinari, Naoko Tsutsumi, and Shūhei Handa, Akko and Andrew are supposedly ended up together with the latter confessed his feelings to the former. However, Yoshinari disliked such because it would have meant that Akko was working for Andrew's sake and not for herself so it was ultimately scrapped. Yoshinari instead sees their current relationship as a "sort of playful guy-guy relationship", which Handa agrees with.
 * Ironically, their English voice actors, Lucien Doge (Andrew) and Erica Mendez (Akko) are together in a relationship in real life.