Crowley - Can speak every language ever. The end. - He will be willing to translate for people, for the price of alcohol. Bare in mind he IS a troll and will occasionally translate things wrong on purpose.
Lorne - Fluent in (American) English, Pylean and passable in a few Buffyverse demonic languages
John Marston - Fluent English - very poor Spanish
Maladict - Borogravian (http://wiki.lspace.org/wiki/Borogravia), Morporkian (http://wiki.lspace.org/wiki/Morporkian) and presumably a little Überwaldian (http://wiki.lspace.org/wiki/%C3%9Cberwald). Though they do echo Earth languages, they're not an exact match. Poor little other planet girl, all alone :<
Spike - Horse whinnies. Raised by ponies man.
Fenris - Arcanum (http://dragonage.wikia.com/wiki/Tevinter_Imperium#Imperial_language) (which is VERY similar to Latin) Qunari (http://dragonage.wikia.com/wiki/Qunari%20language), Thedas commmon tongue and a little ASL - canonically picks up languages very quickly.
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Lorne - Fluent in (American) English, Pylean and passable in a few Buffyverse demonic languages
John Marston - Fluent English - very poor Spanish
Maladict - Borogravian (http://wiki.lspace.org/wiki/Borogravia), Morporkian (http://wiki.lspace.org/wiki/Morporkian) and presumably a little Überwaldian (http://wiki.lspace.org/wiki/%C3%9Cberwald). Though they do echo Earth languages, they're not an exact match. Poor little other planet girl, all alone :<
Spike - Horse whinnies. Raised by ponies man.
Fenris - Arcanum (http://dragonage.wikia.com/wiki/Tevinter_Imperium#Imperial_language) (which is VERY similar to Latin) Qunari (http://dragonage.wikia.com/wiki/Qunari%20language), Thedas commmon tongue and a little ASL - canonically picks up languages very quickly.