I am working on an over the top collage style game with ridiculous amounts of fighters and need some help

[SpkrFrkr]

1. I am wondering if i can set a specific track for each individual stagel.

2. I am looking for multi stage/ multi form boss characters to integrate.

3, I am wondering if ikemen is possibly better for higher resolutions.

4. any recommendations for screenpacks and what not are greatly appreciated though i think EVE might be a good fit for screenpack.