Bayonetta had an existent fanbase and probably did outvote characters like Wolf, Dixie, etc. She's more relevant than Isaac and K. Rool, neither of whom have been relevant to Nintendo in years, and I speak as a major K. Rool supporter and somebody who would've been happy with Isaac.
There's no evidence to suggest Bayonetta didn't win the ballot. People disregarded her chances in speculation because of her sexuality.
I know you might not have liked it or the results, but acting like there was some elaborate conspiracy is absurd. The entire fandom doesn't exist in the forumsphere. Bayonetta 2 sold respectably well enough. Some third-parties you mentioned probably aren't realistic: Note that "viability" was listed as an asterisk, meaning some characters in the top 5 might've been third parties like Banjo-Kazooie that Nintendo couldn't secure the rights too.
Calm down. Nintendo doesn't exist to cater to one person. FE Fates is popular in Japan and Bayonetta was apparently especially popular in Europe.
And please, please don't go "But it's just my opinion" when you've already thrown unnecessary shots at the Bayonetta fandom just because they came out on top.