Esoqq

From Memory Alpha, the free Star Trek reference

Esoqq (meaning "fighter" in the Chalnoth language) was a Chalnoth. Esoqq claimed to have many lethal enemies among the anarchist Chalnoth, but also claimed he had slain the ones that mattered.

In 2366, Esoqq was abducted by a hitherto unknown species along with Jean-Luc Picard, the Bolian Mitena Haro and the Mizarian Kova Tholl in a covert experiment to study their different attitudes towards authority. Food given to Esoqq while imprisoned was inedible for him. Esoqq was released from imprisonment along with his fellow abductees after Jean-Luc Picard exposed the experiment. (TNG: "Allegiance")

Esoqq was played by actor Reiner Schöne.