Assuming they're from Mugen Coder, they should be made by Alexei Roschak aka kenshinx0 (Naruto and Sasuke), so -> Found Releases.
The secret char link leads to a image: http://www.picable.com/Abstract/Naruto-vs-Sasuke.3734895 by shone411. Maybe he wanted to link to Cliff's "Secret" Naruto.
Next time, direct links, no one finds those short links useful, do you understand? Adf.ly is really annoying, and now lnx.lu ?