Character ideas for upcoming story

I plan on making a ponyfied version of gurren lagann and need ideas on which ponies, dragons, etc. should play which character.

I already plan on having Spike as Simone, and Disord as the Spiral King, the rest I need some help on. If you have any ideas, please let me know, I'll take almost any ideas.

Thanks and I hope you all will get to enjoy this story soon.

Update: I decided to have Solar Flare as the Spiral King instead of discord and have some ideas for some other characters, but I'll still take some suggestions as of who whom.