Okay so I had an idea for a RP (and also a story) that is a crossover of the SE anime (set 25 years later) and an AU of Blue Exorcist where the Blue Night never happened. The plot:

Twenty-five years after the events of the Soul Eater anime, the Reaper formerly known as Kid has twin sons, one a Meister, and the other a Weapon, like his mother. When out on a mission to collect their witch soul, the twins encounter Medusa, who survived because of a deal with Satan. As Medusa is drawn into Gehena and Assiah, the twins are as well. However, there's a problem... the Weapon twin can't change back to human form!

And the cast, which will be divvied up:
- Meister Twin Rex (moi)
- Weapon Twin
- Izumo Kamiki
- Shiemi Moriyama (this one is required to be played yandere as a change)
- Mephisto Pheles
- Medusa Gorgon
- Shiro Fujimoto
- Shura Kirigakure
- Igor Neuhaus
- Amaimon
- Kaoru Tsubaki
- Various teachers, students, and demons
- Satan (will appear more in Arc 3)
- Illuminati (Lucifer and associates)

There will be four arcs:
Arc 1- The twins adjusting to life in Assiah, as well as fighting Medusa.
Arc 2- Mastering a Death Scythe, and fighting Amaimon. 
Arc 3- Izumo is captured by the Illuminati, a traitor is revealed, and Rex goes rogue.
Arc 4- Fighting Satan's eight Demon Lords, and finding a way home.

[b][url=http://fc04.deviantart.net/fs70/f/2014/149/b/7/reapers_in_assiah_explanation_by_antrakha-d7jydf1.jpg]Here[/url][/b] is an explanation of the relationship between Assiah, Gehenna, and Sepulchre.

Okay, so that's everything in a nutshell. If more info is required, just ask!