Seeing that Cloud was obsessed with becoming a 1st class Soldier and his severe regret for his past failures, does Cloud have obsessive-compulsive disorder?
He placed himself into Zack's life in his mind and you think he just had OCD? Or are you just talking specifically about FF:AC? In which case, I'd have to agree with WK that depression seems a more likely diagnosis.
More-so AC than other installments. I know that Cloud has clinical depression, but I figured that how he was constantly putting himself down in AC for his past failures and other misfortunes, he may have also developed OCD.