All of the ones that are simply a color, a black line, and white text didn't fit, and needed an overhaul.
Tango Roll is his bouncing ball mode.
Rush has his forms (Coil and Jet crops are loosely based on the MM7 icons, but I didn't use those because seeing his back and tail is more appealing and cute). Marine was made to look similar to Jet, as they function nearly identically.
Treble Sentry and Eddie Bomber are low-res art similar to what was done with the Sakugarne weapon.
The 1UP upgrade heads were also too snug to look ok in that space, and thus could use some changes.
Proto shows his shield and buster in the middle of charging.
Bass depicts his rapid fire spread.
Duo is his detached arm from chapter 8.