Butterfly

Combat
They have poor stats overall, but they get decent Magic, Mana and speed growth. There's three ways to make use of them.

One is to make use of their Slow effect and Agile in order to hit & run. More effective if you add other status effects into the mix (e.g. equip a PoisonedBlade).

Two is to make use of their Extract/Transfer/Drain mana in order to take mana from enemies and give it to your allies, while keeping your party's lust down as well.

Three takes the most time and effort, but can produce the greatest results. Between their Magic and Mana growth, flight and agility, mana stealing and the fact they only get one set skill leaving plenty of room for other spells, they can effectively be turned into self-sufficient mobile artillery.

Trivia

 * Small and light to be able to fly, which also makes them very fragile and weak.
 * Even though their bodies are quite small, their pussies manage to fit quite a bit, causing visible stomach bulges for almost any cocksize.