Once Tekken 2 is available at the brazilian PSN, my main will, certainly, be Heihachi. I remember having a great time playing with him! However, when I had a PSone, I would, almost always, play with Yoshimitsu...so he was my main back in the days.
About Jun...I remember spending a long time trying to master her command list, but I have always been a terrible player. Despite not playing with her that much, she is my favorite character!
May you all find good fortune on your musical adventures!