A lot of people are saying the best character is the one you like the look of the most (which to an extent is true), but as you're specifically asking for character recommendations I'd suggest Dragunov, Shaheen or Kazumi. They have good, strong 'normal Tekken' moves and none of them have anything so difficult that it will be a big barrier to entry. Their movelists are quite concise, and in my opinion they'll teach you the right skills required for playing Tekken well, without having anything which will get you into bad habits as a new player.