Put note on most of the things I could Identify, though the blue blocky head next to bomberman and Uboa I'm pretty sure is a thing in Cave Story, the E power up next to the pokeball I could swear I know were it came from but I wouldn't be able to tell you and I don't know which slime came from which series and finally the cat thing on Miku's legs I thought came from Lucky star but it's not white so no idea. Hopefully someone will come and correct the possible mistakes and finish putting the notes.
Edit : Looking at the tags make me realised that I'm in dire need of rest, added a few notes.
meh, it gets to a point where Slime monsters are such a common theme they start looking the same from whatever series they come from. Like Skeleton monsters or something.