[Kotohono]

Three nice ones of Kami Nomi characters in other series's OP/ED[warning some not-yet-anime characters may appear for some small parts in these]:
Kami Nomi x Little Busters OP:

Spoiler for Little Busters Crossover:

Kaminoshiranai monogatari[Kami Nomi x Bakemogatari ED Miku ver.]:

Spoiler for Bakemogatari Crossover:

Kami Nomi x Durarara ED 1:

Spoiler for Durarara Crossover: