I'll keep this short and simple.

Make the Winmillion's (or its future 5* version's) charge attack disc into a whirlwind that can pull in enemies like it's a Graviton Charge.

That's right. A moving bolt of energy that can suck in enemies as it moves across the screen, dragging its catch with it. Of course, a sword shouldn't replace the function of a specific bomb entirely, so maybe it wouldn't quite match the Grav/Elec bombs in damage (and definitely have a bit less pulling power). The current Winmillion charge attack is already low on damage and a bit underwhelming, so this totally cool charge attack would be a nice change for Winmillion users.