Give me some idea on What Kind of Vote to do upcoming

Usually, I hold a vote on what character's update you want to see most in the next update.

But as characters are added on, there are just too many to choose to vote for. Please give me some idea on how to do the next update vote below.

My current idea is to pick a few characters (around 7~) of my choice make a Patreon/ SS vote and let the most voted character come in the next update. If you have another idea, let me know it.