Prinny: Can I Really Be the Hero?/High Tome Forest

Boss
Depending on when the Prinnies come to the Forest, they will face either Anise or the duo Kim and Chi. Just dealing with two bosses at once can increase the difficulty, so it's generally preferred to face Anise. Raiding the Forest as the third stage will cause Anise to appear as the stage's boss.

Anise
Anise is very predictable, and spends much of her time in cat form, where she not only can't take any damage, but can't really do any damage, either. She will run from one end of the room to the other, stopping on either end to cast some spells or swing her axe.

If she casts spells, she'll summon one or two monsters carrying bombs. Kill off the monsters quickly and stun Anise with a pair of quick Hip-Bumps (she has two skulls on her health bar that have to be knocked off before she becomes stunned). Two or three rounds of stunning and then slashing her into oblivion should set her into critical health.

Her only major change of pattern in critical mode is that she may cast a spell that launches a large magic bolt at the Prinny that will be pretty hard to avoid anywhere near Anise. Try to keep close to her when she's getting near either end of the room in cat form and hit her fast when she starts casting her spells, or get away from her if you see the spell coming. One more pair of Hip-Bumps and another lashing from the Prinny slashes should take her down quickly.

Kim and Chi
Kim and Chi are more difficult because there are two of them rather than because of anything they do in particular. The Prinnies will find it easier to deal with them if the pair are kept apart. Just stay away from them when possible and try to get a Hip-Bump on one of them when the individual attempts an attack. Both Kim and Chi telegraph their attacks by yelling and giving off a bright burst of light. They also conveniently stay very still while attacking, leaving them wide open to the Hip-Bump if the Prinny can avoid being hit in the first place.

Don't bother trying to stun both of them at once unless they're staying close together (try not to let them do that). As with most boss battles, stun one with a Hip-Bump and use a barrage of air-slashes to do some damage. Keep an eye out for the second boss, in order to avoid an attack if necessary. Two or three rounds of air-slashes on each boss and the battle will be over. Once one of them is out of the way the other will be much easier to handle.