I'll keep pronouncing his name "Tee-dus" anyway. I pronounced it "Tee-dus" even before I saw the ads for FFX since Tee-dus is the Finnish way of pronouncing his name (actually, it would be more like "Tee-doos", though both ee and oo sounds are quite short), so I couldn't really care how those with English accents pronounce it. If I pronounced his name "Tie-dus", that means the spelling would be "Taidus" at least in Finnish. If someone says I'm supposed to use English pronouncing of their names, I still disagree since the Japanese voice actors pronounced Cloud as "Kraudo" and Sephiroth as "Sefiros" or "Sefirosu" in FFVII AC, i.e. using the way which sounds the best in their language.