I finally watched the ending of it today, and I missed a few of the cameos. When I went to look it up on youtube, I couldn’t find it, so I tried to make one myself.
Appearances:
Red and Blue Rin and Len - 1st part
Green Kaito - 1st part
Blonde Meiko - 1st part
Miku Hatsune - 2nd and 3rd part