Animation Question - Character Select (Pixiv Fanbox)

So a lot of people have suggested an animated project of a water peril-based setting. I had been thinking this could be something to work on alongside the other animated project for which the storyboard had been finished recently, so that offered animations will be more varied. The only big important question is of course: what character will we have in this sequence? I've already posed the question on my social platforms, and have the intention of eventually posting a poll here exclusively on my support platforms for you to choose the final candidate. Characters, plus other details/ideas for the animation, are very welcome ;D