Apart from English, Cassie is fluent in Mandarin, Cantonese, and Japanese. As in real life, foreign language acquisition is a requirement in the Special Forces of the MK 'verse. Even moreso for Cassie's unit, since she is required to work with ninjas and Shaolin monks.

(It'd sure be a lot easier for her if everyone just magically knew every language like in Tekken).

Garyn speaks Cyro-Tamrielic (native tongue), Ta'agra (fluent), Dunmeris (proficient), and Jel (as well as any non-Argonian can, which is to say not very).

Ecco is a dolphin. He, like, clicks and whistles and stuff.