Going by the length most likely they were going for a wakizashi but due to the crappy animation quality I'd say those look more like the Chinese sabers:

http://chinesedynastiesc.pbworks.com/f/1...

http://i18.photobucket.com/albums/b115/c...

Tanto blades

They appear to be either Wakizashi or a Japanese styled falchion.

Katana blades.

Deadpool uses katanas. The ones in the image you provided look larger than normal because they drawn that way, but Deadpool does indeed use katanas.

I saw these on a show, and I couldn't find them anywhere.