Rouxls Kaard (Summer)

https://deltarune.wiki/w/Rouxls_Kaard

Kaard is an adult-sized humanoid. His head is diamond-shaped, with long white hair parted to his left, and a face with a slightly melted appearance composed of two diamond-shaped eyes and a large mouth. He wears a royal blue suit with epaulets. In terms of color-scheme, Rouxls is a flashy deep blue except Rouxls acts very egotistically during the events of Chapter 1. He claims to be the Duke of Puzzles, and attempts to stop the party by forcing them to solve his puzzles. However, he is an incompetent puzzle-maker: each of his puzzles consist of the bare minimum of elements — a box and a button — and he makes no attempt to obfuscate the solution in any way. He also vandalizes clues on puzzles he did not create, in order to make them "harder."He uses Early Modern English speech patterns, presumably to appear educated, but this amounts to little more than replacing all instances of "you" with "thou," randomly adding "-est" and "-eth" suffixes, and haphazard capitalization of phrases for emphasis. When his pride is hurt, he doubles down by intensifying his misuse of Early Modern English to the point of incomprehensibility; but when surprised or stressed, he tends to drop it altogether.

Rouxls is also the shopkeeper on the fifth floor of Card Castle; initially, he says that he's merely selling the heroes items in order to raise money to defeat them. After all his puzzles are solved and K. Round is defeated, however, he proclaims he is now their ally as he is "always on the winning side," indicating a lack of loyalty in his character. After the downfall of King, he starts searching for a new tyrant to work under.

Lancer considers Rouxls to be his "lesser dad". Rouxls is alternately irritated with and endeared by Lancer and his antics.