__Race:__ Xenos
__Affiliation:__ Xenos ' Ouranos
__Level:__ 4 (estimate)

Let is a Goblin Xenos. As a Xenos, Let is far more intelligent and powerful than a normal monster.

Let refers to Bell as Mister. Bell mentions that he tries to act like a gentleman. He is shown to have rational thinking as he was one of the few Xenos who did not wanted to attack other adventurers after knowing that Ranye’s group was killed by the Ikelos Familia. 

The third season of Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka. 
 
When Bell encounters a frightened little girl in the dungeon, he doesn’t think twice to help. But this simple act of kindness has consequences. The girl is a monster and proof that monsters can be eerily human. And not everyone can accept this... 
 
(Source: HIDIVE)

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The second cour of the fourth season of Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka.
 
Bell and Ryu end up in the 37th floor, which is a Deep Floor. The rest of the party are at level 27, facing the level boss Amphisbaena. They have to defeat the level boss, in order to save Bell. At the same time, Bell and Ryu have to find a way to stay alive on a floor with strong monsters while having to avoid the Juggernaut.
 
(Source: Anime News Network)