Source

Tuyul
This ghost is that of an small boy. He is usually kept by a man and is given the task of stealing money. Even now some people in Indonesia believe they exist.
(IMG:http://sacred-magick.com/images/tuyul.jpg)
Carcass of a dead tuyul

Many has seen these tuyuls hanging and playing on tree branches. Tuyul reported to have fangs and drank blood from animals and sometimes human blood (feed by their owner). Owners of tuyul (there's a few small villages across java which sells captured tuyuls for $250 - $5000 depending on their rank and skills) would need to feed these astral creature with blood on weekly basis (usually purchased from the hospital/red cross)

Kuntilanak
This ghost of a woman who died during her delivering process, has a hole on her back. She's wandering looking for her child, which means young men in the real world.
(IMG:http://img.photobucket.com/albums/v244/hantuindonesia/hantu19.jpg)
(fake image illustration)

I was told that these Kuntilanak was actually a dryad and holes in their body were actually holes also existed on the specific tree they lived. Kuntilanak was notoriously known as a scary entity seen as a floating woman with plain white long gown and long black hair. Their "hobby" is primarily scaring night walkers with their freakishly long shrieking laughter before appearing and chase these poor people running while peeing their pants off. Their queen can be summoned over a pool of water/pond with offerings such as coconuts, 7 types of flower, egg, and incense. Queen Kunti when summoned reported to be seen visibly by layman as an extremely beautiful woman and smiles with a vampire like long fang. Queen Kuntilanak usually summoned by people requesting lottery numbers

Leak
The leak spirit enabled people to turn into fireballs, animals or strange creatures with fangs, a protruding tongue and dangling breasts.

This creature could fly above roof tops, suck the blood of adults and kidnap babies.
(IMG:http://www.thehotspotonline.com/moviespot/holly/m/Mystics2.JPG)
Illustration of Leak from one movie
What is the leak spirit of Bali?
Balinese Leak

Jin
This myth comes from Arabian culture. Jin is what we might call a genie. Some people in Indonesia still believe in the Jin. Folks, from businessmen to parliament members will buy a Jin to act as their protector.

Kuntilanak/Pontianak article and report from Singapore Paranormal Investigators
http://www.spi.com.sg/spi/spi_files/pontianak/