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He's not that evil, there's like 3 episodes in season two where he's a part of the main storyline. He's just a sports fiend from Brakmar, anyone from Brakmar seems to have a pretty wacky (understatement) mentality.
Just look for people with the Tattoos, there's another episode in Season2 where there's a couple of huge Sacrier bodyguards. (Not being too specific in case of spoilers)
Season one they do use blood, adn there is indeed a special episode in which you see Goultard fight a sacrier. In that you see a sacrier use his tattoo powers. Very nice fight, though the sacrier is evil.
Katar from Goultard the Barbarian fits your bill perfectly.
It seems Sacriers are a bit too gory for Wakfu's target demographic and the TV serie's content rating both though, so I don't think we'll see much of them in the future. If you want some awesome Sacrier stuff, I recommend you look up Les Larmes de Sang and give Dofus a visit so you may know the extent of Sacrier powers.