Rathurue about 6 years ago I also see Saint Tail, Kaitou Jeanne, Hikaru Shindo, Kamen Rider Kuuga and Devilman reverence...
Koucchan about 6 years ago The Pikachu with the "753" cap and "193" signboard is a reference to Kamen Rider Ixa. The Pikachu to its left is KR Kuuga.
balorn almost 6 years ago There's a reddit thread here identifying all of them (in English): http://www.reddit.com/r/anime/comments/23yrjy/henshin_pikachu_by_torute/