Your... blood tells ya that, hmm? Well, I think that'd be a fine set of lyrics. Nothing wrong with throwing around Jungian psychology in video games...
Just noticed. The lyrics are not by Nobuo, but by game director Sakurai. Looking at One Winged Angel and the such probably won't be too helpful...
It really is impossible to hear the lyrics. From what I did understand, and the title (a Main Theme with Emotion), I think it goes through the various emotions related to battling friends. Of course, the only word I really caught was "happiness", or some happy cognate (alegria), Whataver- opera in english is hard to understand, Italian completely difficult... why try the Japanese accented Latin? (the credits are given to a Japanese opera singer, so that is why I'm assuming there'd be a japanese accent)