Yeah! I'm back again! I been to the anime expo, and I saw the costumes includes:

Pikachu
Mario
Luigi
Donkey Kong
Fox
Gir
Pac-Man
Link
Zelda
Toon Link
Marth
Lucky star characters
Haruhi
Ness
Lucas
Pit
Vocoloids (Kaito, Miku, Meiku, Leon, and Lola)
Naruto
Kakoshi
Rock Lee
Cloud
Ichigo
Casandra
Keeby (The Yellow Kirby)
Luthee? (from one peace)
Stitch
Daisy (Mario series, not Disney!)
Yoshi

I think that's all the characters I know?

and, I brought my items

The Full metal container, and the star plush from the mario series!