...given what Desco is like, putting her in the roulette would be a huge dick move on my part.

So! Who wants to exchange with Desco? Mundane memories include things like watching home videos, listening to Daddy talk about Big Sis, and the casual murder of sapient beings as a form of play!

Edit: Let's just lay everything out, shall we? Desco's Mundane Memories include:
Growing up in a giant lab.
Solitary confinement in the maximum security wing of Hades, the Netherworld's Prison.
Not realizing the things she was breaking for fun were human beings.
Forming a gossip circle to discuss the possibility of hot werewolf/vampire action.

Her Important Memories include:
Seeing a giant robot shaped like Lady Archangel Flonne push the Moon back into orbit.
Meeting her Big Sis in Hell.
The destruction of Fear The Great, God's ultimate doomsday weapon.
Being murdered by her little sister, Lady Des-X, and having her eyes eaten while she was still alive.

Her Personality Quirks include:
Speaking constantly in third person.
Deliberately exaggerating her body language to appear more adorable.

Her Skills include:
Making ridiculous over the top ice cream sundaes.
A surprisingly in-depth knowledge of hair care.
The ability to shatter the fourth wall and directly view the level of anyone she meets.
The ability to speak in the blasphemous tongue of the unknowable Outer Gods, of whom she is an avatar.