Treize is the villian of the OVA series.A respected officer of the OZ who later became the ruler of Romefeller Group and the leader of the Earth Alliance.He was a very good friend of Zech's but when the latter turned against him and formed the White Fang,they became mortal enemies.Leading the Earth Alliance,Treize has to face 2 resistance group,the Colony Rebels and the newly formed White Fang.He too has a little affection for his assistant,Lady Une.