[Shadow Kira01]

I have never thought of something like this before. Sounds interesting...

Death Note + Code Geass/Code Geass R2

Spoiler:

By replacing Lelouch with L, but keeping the character design of Lelouch. At the same time, replace Lelouch's manipulation geass with the kira geass would be awesome.

Kuro no Kishidan would become undefeatable and united. Under L's leadership, nobody will need to make a sacrifice, except L himself. After all, L did sacrifice himself in Death Note by making himself the test subject of the Death Note rather than using somebody else.

Instead of recruiting the ace pilot Li Xingke and Empress Tianzi, the recruited pilots should be Suzaku (Lancelot) and Gino (Tristan). I know Gino is on the side of the Holy Britannian Empire, but that's because he had no idea what Prince Schneizel as planning. Gino is one of the best Britannian pilots and his Knightmare Frame also greatly resembles Heero Yuy's Wing Gundam.