Any1 know what banks look 4 in co-signer applicants? I am having a hard time finding one for my student loan.?

I've been banking with Wells Fargo for a while now and I recently decided to apply for a student loan because I will be transferring to a University to begin work on my Bachelors Degree. Of course I was quickly approved, but none of my co-signers can seem to measure up to Wells Fargo's standards. Does anyone know what exactly it is they are looking for? Or better yet, is anyone willing to be my co-signer?!