Prinny: Can I Really Be the Hero?/Demon Sea Aria

Boss
Depending on when the Prinnies raid this stage, they will face either Bok Choy, Turmeric, Cardamon, or Cyberclops.

Bok Choy
Bok Choy is one of the easiest bosses in the game. All he does is hop around the stage like a normal zombie, so it's fairly easy to stun him. Air slashes do more damage, so it's quicker to use those.

Bok Choy will appear as the boss when this stage is taken on first.

Cardamon
Cardamon may be the more difficult of the bosses available for this stage. However, with good timing and the right steps, this cat-girl will have one less life in no time.

She likes to jump, and she likes to punch. Prinny will have the best chance of getting in a Hip-Bump to stun her when she's throwing punches or has just completed one of her diving jump-kicks. Staying in close will get her to throw punches, but can be pretty dangerous (and somewhat unpredictable). If you keep her near the far edge of the screen, she'll eventually try her diving jump-kick. You'll know it's coming because she'll jump straight up and stop in the air before starting the kick. When you see her do this, double-jump straight up and then drop a Hip-Bump on her as she lands beneath the Prinny.

Once she's stunned, hit her with a barrage of air slashes. Watch the stars and get the Prinny moving away from her when she starts coming around (the stars start disappearing). When Cardamon comes to, she usually charges across the screen in two or three horizontal charges. It's best to just stay away from her when she does this, or to jump away from her. It's possible to stun her when she's doing this, it's just not always easy to do so.

After two or three rounds of stunning and air-slashing Cardamon, her health will be critical (she'll turn dark red, like most other enemies when their health is low). At this point her pattern changes slightly. When she lands from her jump-kick, she'll immediately move to attack again. This won't make a great difference if you stun her right away, but be aware that if you miss, you'll need to get moving quickly to avoid getting hit.

Cyberclops
He has 3 stun counters. He may attack with a blade and and snipe you or throw his blades. After you stun him hit him with air slashes. After you've hit him he may nuke the terrain with bombshells. Now avoid his blade and sniper attacks, and stun him. Do this cycle and you'll defeat Cyberclops.

Alternatively, start hip pounding him again just before the stun wears off, and you should be able to stun lock him for the rest of the fight.