Here's the characters that each game introduced with my fave pick for the respective generation.
The characters in ()s mean that they are a new person, but on terms of gameplay, it's just an alternate costume to an already existing character (Tiger); a fighter from a new generation based off an old not-returning character (Forest Law); or simply a non-original character (Mokujin).
Tekken 1 (16+1) - My: YOSHIMITSU (T3)
-Anna -Armor King I -Ganryu -Heihachi -Jack -Kazuya Mishima -King I -Kuma I -Kunimitsu -Lee -Marshall Law -Michelle -Nina -P. Jack -Paul -Yoshimitsu -(Devil)
Half of mine is characters that have been seemingly abandoned:
Tekken 1: Michelle Tekken 2: Kunimitsu Tekken 3: Yoshimitsu Tekken Tag Tournament: Jun Tekken 4: Only one I haven't played so far Tekken 5: Asuka or Dragunov, but seeing as I never played DR, I'd have to go with Asuka. Tekken 6: Hmmm, Zafina or Miguel
John Lennon, 1940 - (Infinite Symbol) PSN: naathaann