Aechema is the leader of the Moon People, playing an antagonistic role throughout most of the story, though he is not introduced until later on.

He has a calm demeanor, but is very weary with the eternal life the Moon People possess.

He is extremely intent on having Kongou pray for the Moon People in order to allow them to pass on, viewing the 'eternity with the restless nature of humans' to be a 'terrible curse.' To achieve this, he is prepared to go to great lengths. Over abducting gems and grinding them into dust, he displays no remorse, showing he can be very cruel. Aside from that, he generally behaves politely.

After so long of failing to persuade Kongou, he has become desperate and prone to moping. He appears to have some degree to self-loathing, calling the Moon People, including himself, 'ghosts of garbage,' and being ashamed of his real name, leading Phos to describe him as a 'complex guy.' However, he retains some hope that Phos will save them.

According to other Moon People, he gets drunk easily.
(Source: Houseki no Kuni Wiki)

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