So im making a white cake with 1 layer of chocolate mouse filling and one layer of raspberry filling so i was wondering what kind of frosting do you think would go best? please help me out with any idea's you might all have!!! Thank you sooo much.....

I would do a deep dark chocolate or chocolate ganache.

I vote for Chocolate Ganache too......or if you want to do more decorating, maybe a white chocolate buttercream