Yamaceles

Yamaceles is the het ship between Hifumi Yamada and Celestia Ludenberg from the Danganronpa fandom.

Canon
Hifumi regards Celestia highly, even referring to her as "Mistress", and following every one of her orders. Despite the fact the first major seen interaction between the two resulted in Celestia smashing a cup of tea in anger and berating Hifumi harshly for preparing it incorrectly.

He seems to be extremely protective over Celestia (or just has a strong sense of justice) as shown after she lies to him about being assaulted by Kiyotaka Ishimaru, he is willing to kill Kiyotaka for such a thing.

During his last moments of life, after being asked by Aoi Asahina about who attacked him, Hifumi begins saying "Yasuhiro...". It's later revealed during the Class Trial that he meant Celestia's true name - Taeko Yasuhiro. Since the head trauma from the injury caused him to regain his lost memories right before his death, this means that at some point during their time at Hope's Peak Academy before the Killing School Life, Celestia told Hifumi her real full name, which she kept secret from everyone.

Shortly after Hifumi and Celestia's deaths, Makoto Naegi along with the remaining students discover a picture of Hifumi, Celestia, and Sayaka in Hope's Peak Academy before the Killing School Life and The Tragedy began. In the picture Celestia is angrily holding onto Hifumi for stealing her fake eyelashes as Sayaka laughs, however it doesn't seem to be any sort of threatening anger, and Hifumi seems more amused than afraid. This could indicate their previous relationship was a more friendly one, and not the cruel bullying one they have in the Killing School Life.

In many pieces of official art, Celestia is shown to be sitting on top of Hifumi, literally using him as a chair, solidifying their relationship as him simply being used.