I'd like to start by suggesting that a Top 100 list may be a bit large. Narrow that field down to 50 and it may seem more reasonable. Now, this is your project, so I don't want to step on any toes... but as big of a series as Final Fantasy is, I am having a hard time thinking of 100 characters all worthy of being on a list like that. 100 encompasses ALL characters of any significant meaning, including most major bosses and whatnot.

Given that you're up to taking nominations, narrowing the final field to 50 seems more appropriate.