It is vey-ZONN and GAY-loo.
You're not. Angonce is a Great Being introduced really late in the game, and never got more than a couple paragraphs or so. Scodinus Scodonius and Kirbraz are among the most forgettable characters there is. They're the two Water Agori who drove the Kaxium V3. Ehrye is also forgettable.
More things I mispronounce are Hgaha names; Kualus, Iruini and Gaaki. Canonically it's KOO-ahl-luss, EYE-roo-NEE and gah-KEE respectively, but I pronounce Kualus like his name was spelled in some prototype stage, that being, Kuuls, and Iruini and Gaaki like in the movie (or maybe it's the Swedish dub of the movie?): IRR-ouh-EE-nee and GAH-ah-KEE.
Onewa is kind of a hard one to say whether or not I mispronounce, since there's been three official pronounciations: oh-NEE-wah, oh-NOO-wah (both in different prints of The Official Guide to BIONICLE (2003)) and AH-new-wah (which Greg uses, found in BIONICLE: Encyclopedia (2005) and Encyclopedia - Updated (2007)). I pronounce it like the first one, but apparently insists it should be the last one.