Egg Plant. I used jump-punch attack immediately followed by high punch. Rinse, repeat. Sometimes he will catch us with his counter-grab, but it doesn't kill. The only danger is his "kick" attack if used right before our punch. There is no way to dodge it so we will just die. Still, he's not too difficult and only took about three or four tries.
Meat Catcher. This is a hard one, but the tactic is really stupid. I simply get close and mash him with high punch repeatedly. The only way he can escape this lock is the tongue attack, and half of the time it will be countered by our punch. Another half of the time it hits, though, and we die. In total I spent like ten to fifteen tries to kill him.
Fluid Hunter. Same as above. The only attack that doesn't get countered by high punch, and therefore kills us, is the quick hand slap. Took about ten tries.
AlauLune. I stand right between the two spots where underground tentacles hide. I masturbate to get full SP, then throw overdrive at her. At that point she can hit us only with thrown spikes, and if you spot them early enough, it's even possible to interrupt masturbation and block them. This one also took about ten tries.
Expand Bee. Yet another case of high punch mashing. But this one has more uncounterable attacks that kill outright, so he will take even more tries than Meat Catcher.
Evil Fairy. This is the hardest one, because there is no definite tactics. Overall strategy is to keep at distance, hit her with quick air attacks and retreat. Masturbate at every opportunity and use Fairy Fire at her.
Amoeba. In it's current state it's really easy. Just get at distance, masturbate to full SP, get close and use Fairy Fire. Sometimes the slime would catch you, but it's grab does not kill. It uses uppercut attack very rarely.