All of Sonic voices fail, all but Shadows from S.A. 2. (English voices at least, in 95% of Sonic's games they don't go with the character mouth =/, Sonic Team gotta reforce there, the Translations they're making are worse everytime.)
SD(This being the SD root)>Private>wii>app>RSBE>pf>Fighter (Here you make a folder for the respective characters and inside put the .psc/.pac/fit***motion [For example: Fighter/marth/FitMarth01.psc (This'd be the costume)] SD>Codes>RSBE01.gct (This would be the code file you'd use that Gecko will be loading)
Try setting stuff in order in case those are the problems.
Are you using Custom Song Names? Last time I had to put a "?" on everything on the common3.pac for this, if you aren't, try making a Backup of your SD and format it, then get everything inside again and try, if not, try telling us where do you have place the "codes", and codes you're using, and if possible, the Folders where the Brawl Hacks (RSBE-pf) are placed and which are you using, no need to name the files inside "fighter".
One of the Links is a "supposedly update" of Sephiroth, I'm not really sur eif Hair was edited, but who knows, hope you get Soren to look alike, since it was a shame FE: Radiant Dawn had no MDL0s D: