Yeah the filesize is the only thing I can think of that could have been the problem, but it's strange since the actual mb count for the common5.pac wasn't too large, and neither were the individual portraits.
The CSPs were from CrazyHandMasterHand's Lucina PSA v1.5, I can upload the images in a bit.

Yeah, the dimensions are correct. As far as I can tell, I've done everything right according to tutorials, but I must have missed something since it's not working.

EDIT: I got the CSPs working, I tried importing them as cmpr files, and it worked. They're slightly lower quality, but it's hardly noticeable in-game.

Yeah, I just replaced Marth's six CSP and his name, making the common5.pac file size 11,989 KB, where the original is 11,919 KB, that isn't too large is it? I've started using BeyondYou's XML, which said I don't need to type the _en at the end of the common5.pac. The other parts of the PSA work fine, the model is showing up as it should, I just can't get any of the csp stuff to work.

Okay, I did that, but now the game freezes as soon as I get to the character select screen.

I replaced all of Marth's MenSelchrFaceB files and his MenSelchrNm file, but they won't show up on the character select screen. Where exactly I put the sc_selcharacter_en.pac? I'm using Riivolution, and I placed the sc_selcharacter_en.pac in E:\private\wii\app\RSBE\pf\menu2 on my SD card, is that the correct place for it?
Also, do I need the _en if I'm using Riivolution, or is there a different problem? Thanks for the help.