This is a monster I came up with based upon a card in Paizo's Harrow Deck.
The Rabbit Prince
Armor Class: 18
Hit Dice: 10**
No. of Attacks: 1 Sword
No. Appearing: 1
Save As: Fighter 10
Treasure Type: Nil
The Rabbit Prince is something of a mystery. He appears as a four foot tall, bipedal rabbit dressed in ruined finery, wearing an old crown and wielding a broken sword. He roams the wilderness, occasionally attacking farming villages. He has a deep hatred for predators such as hawks and wolves, as well as for the plow. Basically, anything that kills a lot of rabbits, even unintentionally, can become his target.
The Rabbit Prince will not attack elves or druids unless they attack him first. He will defend rabbits from any attackers he sees (including oxen pulling plows in fields).
He moves at a very rapid pace, and anyone making ranged attacks against him suffers a -2 to hit. He can leap up to 40 feet and attack in the same round. He has supernatural strength, which is reflected in the damage he deals with his weapon.
Once per turn, the Rabbit Prince can thump his foot on the ground rapidly. This is very loud, and anyone within 15 feet attempting to cast a spell must Save vs. Paralysis or lose the spell they are attempting to cast.
The Rabbit Prince is effectively immortal. If killed, he will reincarnate in a random burrow within a few weeks.