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Date Masamune was pretty high up last time, only topped by the likes of X and characters that got into UMvC3 if I remember correctly.
Pixiv is basically a Japanese site for artists, but I've heard that game developers search for artists on there sometimes. So while it's not a special DLC poll, there's a chance it will be looked at and considered. (But only as much as any other DLC poll.)
That being said, if Date Masamune got in, I would have my perfect team with him, Wright, and Ammy.