- Aru's character theme song is "Song of A Certain Truth" by Alice Rokugen. It expresses a desire to protect a certain person from the hardships and lies of the world, and to live a peaceful life with that person forever. It also meditates on the nature of Truth, wondering what counts as the truth and whether it's better to know nothing and live in peace.
- His given name, Aru, can mean "exist" if written with different kanji, which could be a subtle hint to Aru's true origins.
- In the Japanese dub of the anime, Aru's voice is deeper than Yuki's. However, this is reversed in the English dub.
- Aru is in love with Yukiteru, despite claiming that he isn't interested in boys. He kissed Yukiteru to make Yuno jealous and charge at him. However, the extent to which this love is Aru's own is unclear; when Aru tells Deus that he loves Yukiteru, Deus tells him it was also part of his plan.
- Third World Aru is called an Observer by Third World Murmur and Deus.
- Incidentally, the Detective Diary's ability is is the same ability Aru pretended to have when he faked being a Diary user against Hinata.
- In the Third World, Tsubaki has her eyes on him and is a complete stalker.
- Aru Akise is very similar to Nagisa Kaworu from the Evangelion franchise, particularly their love for the protagonist & close relationships with them. They also both have white hair, red eyes, holy origins, and are both voiced by Akira Ishida.
Oops! This image does not follow our content guidelines. To continue publishing, please remove it or upload a different image.
Oops! This image does not follow our content guidelines. To continue publishing, please remove it or upload a different image.
Oops! This image does not follow our content guidelines. To continue publishing, please remove it or upload a different image.
