Ankama's French-language dub of Gurren Lagann shares most of Wakfu's voice cast. Yoko and Evangelyne share Geneviève Doang, and Cédric Dumond (the obnoxious announcer during the "Gobbowl Hell" arc) is also Kamina. Other notable ones are Nia/Amalia, Kittan/Nox, Viral/Xav, and Tymilph/Rubilax.
The series also features some well-known voice actors. In the 3rd episode, Kabrok/The Black Raven is voiced by Richard Darbois, who is better known as the French voice of Harrison Ford and Batman in Batman: The Animated Series (among many, many others).
Kriss Krass (the captain of the opposing team in the gobbowl arc) is voiced by Mathias Kozlowski, who also did the French voice for Tsubasa Oozora from the football anime Captain Tsubasa. The voice casting director said that it was not a coincidence that he thought about him first (but he still got the role because his voice matched the character).
Remington Smisse is voiced by the same man who voiced his cousin Monde Smisse. Grany is voiced by Kriss Krasse's voice actor.
Allegedly, according to an unsourced Wikipedia entry, Wakfu's 2009 English "test dub" was done by Code Lyoko's dub voice actors. This cannot be confirmed as the test dub is extremely rare and hard to find, but Wikipedia's list is reproduced here:
Missing Episode: The artbook "Dofus - Les mains d'Eniripsa" presents the plot of an unseen episode, going as far as providing a full summary, character design, and even background design. The episode was about Yugo and friends trying to save a village from complete dryness. For some reason, the episode was scrapped and never produced. The only remaining bit is the title character, a charming Eniripsa called Mey d'Elongrot, who was present in the crowd as a cameo in episode 10.
Recursive Adaptation: The Dofus MMORPG was the basis for the Wakfu MMORPG on which the Wakfu series is based on, and in the near future we will get a Dofus series which is technically based on the Wakfu series.
Screwed by the Network: The series has been aired somewhat erratically on the French television network, France 3, including more rediffusion than usual, changing time slots, and gaps of several months between new episodes (the last one being a two-and-a-half-month pause before the final three episodes). Viewers were not happy.
Word of God: Yes, in season 2 Sadlygrove and Evangelyne are a couple and have a physical relationship. No, no need to fanwank about how and when Grovy had seen Eva naked, as mentioned in season 2 episode 8; it just happened off-screen. Nothing else to see, move along. (You can find the relevant comment by Tot, the series' main writer, in the official Wakfu forum, if you can read French: )