I used the Google search function and nothing so I thought I'd throw the idea in. I don't know what your plans are for adding bosses or multi-man to Crusade, so forgive me if you're not going to give us either. Since I never played Brawl, I was looking at the wikia to get familiar with it and saw the Fighting Alloys which instantly reminded me of the Axem rangers. They were possibly inspired by these guys, but I didn't read further and proceeded to search the forum and then write this up really quick.
Thinking of how these characters could be added into the game. First as a boss fight and this part involves lots of spriting since they each have unique abilities, but it'll be worth it since you'd have to strategize on who to eliminate first if they don't overpower you already. The pink one if I remember correctly since she heals her team. Btw, they each have a unique op ability, so you couldn't add them into the roster, though fully sprited. I forget if they collectively attacked you as well and that would be the breaking force into crusade. Final smash like attacks every few seconds, and those get weaker and change formation as you eliminate a team member.
Next is Multi-man mode. I don't know what to write here so on a final note
Axem Red: We fight for evil!
Axem Black: We live for disorder!
Axem Green: We like what we do!
Axem Pink: We struggle for chaos!
Axem Yellow: We are...