An experienced human Hunter who takes the Ash under his wing. Though capable and possessing of an honest heart, he lacks the motivation to reach his full potential. His partner within ARKS is Echo, a childhood friend with whom he shares a close though vitriolic relationship.
When Dark Falz Elder is released from captivity during Episode 1 arc, Zeno fights him head-to-head in order to buy time for Echo and Ash to escape with Melphonseana. When he does not return, he is declared Missing In Action.
In Episode 2 arc, Zeno is retroactively rescued from his own Heroic Sacrifice when Ash, Sarah, and Maria help him repel Dark Falz Elder with the power of Time Travel. He goes into hiding and trains in secret under Maria (the details of which are expounded upon in supplementary material), walking the path to becoming the 4th member of the Council of Six and gaining the power needed to wield the Sword of Commandment, Nanaki.
In Episode 3 arc, despite come out of hiding and having ascended to the Council of Six, his training continues, this time with the company of Echo.
