Nice! I'll give you some tips:
1. Try to consider some of the most common mindsets with the Smashers. What I mean is that try to consider people that want to play to win, people that want to play to have fun, or the in-between.
2. I think you can add an appropriate number of characters. I think that the max number of characters or different playstyles should be 3, but that's just me.
3. There are some people that don't care about tier lists, and I understand you. Some players think that tier lists are not important and they should not care, while some do care.
While it is difficult to arrive to a general consensus of finding a main character, I applaud you for that. It did help me so good job! I plan to redo my guide on how to choose a main, so yeah! Thanks and hope it helps! XD