Euclase is a supporting character in the anime and manga series Houseki no Kuni (Land of the Lustrous). Calm, composed, and highly responsible, Euclase serves as the secretary and aide to the leader, Kongou-sensei. They are trusted with organizing missions and maintaining order among the gems. Euclase’s cool-headed nature and reliable personality make them an indispensable member of the group, often mediating conflicts and handling administrative work, ensuring the smooth functioning of their society.