Taliesin Jaffe is like his critical role comrades an actor in many games and series. his entire work can be found on IMDB http://www.imdb.com/name/nm0043552/ .
His character of Percival Fredrickstein Von Musel Klossowski de Rolo III, or percy for those who do not want to take three minutes saying his name lol. Percy is the only human in the party and he is also of noble blood. He is a gunslinger/fighter. the critical role campaign originated in a pathfinder campaign and converted to 5e hence the need to home brew a gunslinger fighter archetype for him. percy/Taliesin started off being a bit of a background player, but he started to come out as a strong Rper during the briarwood arc where the demons of his past came back to bit him real hard. his interactions with Victor the black powder merchant are legendary in there comedic tone and percy is now obligated to visit victor every time he visits the city victor is in. unfortunately a lot of the cooler details about percy are spoilers and I try not to have too many spoilers in these blogs so I am forced to be sparse on his exploits. another trait of Taliesin is his ability to roll natural 20’s a lot thus scoring a ton of critical hits on opponents hence his fan nick name of no mercy percy.