Man, Attack Liner really makes thing easier...before I was running out of the Unite Charge, but if you use the Attack Liner, you can just keep drawing lines into the foes to quickly fill it back up. :0
Furthermore, I have that one Custom Block that converts excess Unite Charge energy into HP, so I can also spam the Attack Liner to heal. Neato.
I've also begun to realize how, like, powerful Unite Hand is. I wasn't really using it much and fights were taking a long time, now I'm using it way more and realize how strong it is. I guess all the other Unite Powers are meant to be used alongside it and to defeat specific foes while Unite Hand is your main power. Do other people do it this way?
I want to promote the first part of this post just because people need to learn of more ways to refill their gauge anyway.
Basically, anytime your teammates are attacking without using a morph, they get you back some charge. This can come from Attack Liner, from Climb Attacks (although you have to wait through the climbing animation, but when they start doing damage they'll even up your combo total a little), and from just being next to an enemy they can hit while you're doing something else.
As for the second part of this post, using the main seven morphs...
Hammer > Fist > Bazooka > Whip > Sword > Gun > Claw > Bomb
I think that's the power level of each morph. Bomb might technically do more burst damage than Claw, and I only rate Gun so highly because 90% of the time I pull it out for it's Wonder Stinger.
Still, it overall makes sense considering range and attack speed, with the outlier being Claw and it's combo point potential.
I don't get the Prince Vorken fights. Nothing I do works, I get through them, but they're frustrating and cheap as hell. Everything he does breaks through your attacks or counters. The most least fun portion of the game by far.
Vorkken fights are more like Bayonetta. You need to dodge. Luckily, if you don't use up all your guys for a morph while attacking him, then a few of them should be slamming into his guys and getting you some gauge back. Always try to keep at least one bar so you can dodge. Dodge away from his attacks, with the exception of Unify Boomerang.
So basically dodge, use a mid to long ranged attack (Gun, Claw, Whip, etc.), dodge, and continue until he uses an attack you can block. Block that attack, then pull out the biggest Fist or Hammer you can manage, and beat his face in for three seconds.