Witch Girls Adventures
Witch Girls Adventures is a Harry Potter-esque role-playing game published by Channel-M. It uses the "Drama Diaries" system, where your character's stats are represented as different-sized dice, from 1d2 (i.e. flip a coin) to 1d10. Checks are made by rolling your stat die and adding a relevant skill's ranks to the result; every check has a difficulty number ranging from 4 to 20+. For example, if your character's Body stat is D8 and your Athletics skill is 5, you roll 1d8+5 for Athletics checks.
The game is primarily aimed at a tween/teenage female audience; its stated objective is to introduce young girls to RPGs. Due to its combination of underage magic-using girls, vore and shrinking fetish overtones, and obvious condonation of murder for trivial reasons, it is also guaranteed to spark the imagination of /tg/ whenever it is posted.
An unofficial Harry Potter supplement is also available; the game's creator statted most of the books' main characters to be played at conventions.