Ooh-be-soft or you-be -soft
Snez or es-en-ee-es
Mah-rio or maw-rio
Four-za or Fort-za
Eye-co or eek-o
Blast core or blast corpse
Fight!
The only controversial pronunciation I can think of is gif, and the matter has been settled by the creator.
It's Mah-rio, Fort-za, U-be-soft, because the words Mario/Forza/Ubi are latin/italian, eek-o because that's how Japanese pronounce it. Snes or es-en-ee-es depends on the way you pronounce acronyms in your native language.
I don't get the Blast core/corpse one though.