Quote Originally Posted by Yaridovich View Post
How do you pronounce it?

Personally, I think it actually should be pronounced just like the kana way of spelling them. However, I don't always follow my own belief.
Mainly because you're incorrect. The 'fi' 「フィ」 kana is not used in 'Fire'. 'Fire' in katakana is 「ファイア」 (faia). Therefore, you would pronounce it almost like you would in English--

「ファイア」 (faia) = Fire
「ファイラ」 (faira) = Fira
「ファイラガ」 (fairaga) = Firaga
「ファイラジャ」 (fairaja) = Firaja

「ブリザド」 (burizado) = Blizzard
「ブリザラ」 (burizara) = Blizzara
「ブリザガ」 (burizaga) = Blizzaga
「ブリザジャ」 (burizaja) = Blizzaja

I'm not exactly sure what 'Thunder' is when changed to katakana though. But these examples should give the main idea. However, since most spell names are in katakana, I just pronounce them in English.