Ethan is the gay twin brother of Aiden. Both are werewolves and have talent to meld their bodies into the form, Voltron Wolf. In Season 3, Ethan and Aiden have alpha status and are members of Deucalion's pack of alphas. The twins, as part of the Alpha Pack, are initially in Beacon Hills to recruit Derek Hale and later attempt to recruit potential True Alpha Scott McCall. Ethan and his brother enroll in Beacon Hills high school and he starts going out with Danny Mahealani to gain leverage on Beacon Hills' supernaturals. The alphas carry out an assault against Derek's pack which results in fellow alpha Ennis' death. After the the Darach targets Danny, Ethan genuinely falls for him, then softens towards Scott. During the fight against the Darach, Ethan learns it was Deucalion who had actually killed Ennis and defects from the alphas. Ethan and his brother fight Jennifer Blake as Voltron Wolf, but fail. The twins survive, but their alpha power and merging talent is broken and they fall to omega rank. After the Alpha Pack's disbanding, Ethan and Aiden decide to remain in Beacon Hills. They seek Scott out to join him as pack members, but Scott denies them entry particularly their part in Boyd's murder. He and his brother align with Scott's allies against the threats of the oni and the nogitsune, and eventually conform to Scott's way. Ethan and his brother, taking inspiration from Derek's advice so to become part of Scott's pack, join him in making a final stand against the dark trickster. This eventually leads to Stiles being freed from posession, the nogitsune being imprisoned, and the oni being destroyed, but at the cost of Aiden's life. A grieving Ethan holds his dying brother, then decides to leave town. He parts ways with the pack as well as Danny, lighthearted that Danny knew all along he was a werewolf.
Ethan is openly gay. He is more aloof, level-headed, intelligent, sensitive and reserved compared to his twin. He is intelligent, calculating and feels guilt for his actions. Though similarly to his brother, he displays a sense of honor in joining the Alpha Pack out of fealty and later assisting Scott and his allies against the Nogitsune earning redemption. Ethan is also gay.
- English, with Aiden and Scott
Braeden is riding away on a motorcycle with a bloodied Isaac sitting behind her. Ethan runs down the road giving chase at enhanced speed and Isaac picks up the alpha's prescence. Going neck and neck with the bike, Ethan swipes away at the bike with his claws to have it run over before Aiden catches up. The twins chase after the bike, attempting all manner of trying to take the bike down and intimidating Braeden's resolve, but the young woman hangs on whilst Isaac becomes more and more drowsy.
The chase continues throughout the district until the twins chase Braeden's bike through a window. Isaac, exhausted droops on the woman's shoulder and they fall to the ground.
Ethan then gets down on one knee and hand, Aiden impales his brother in the back with his claws and this triggers their merging talent.
Seconds later after writhing from the backlash of the merge the twin stand before Isaac and the injured mercenary as Voltron Wolf. Snarling, they move in to attack Isaac and Braeden, knowing their power far surpasses his.
However, Braeden comes to, and shouts at Isaac to duck, while Ethan and Aiden rush forward with their attack. Braeden fires her modified military grade taser, and an electric bolf hits the Voltron Wolf square in the chest. The merged wolf falls back from the shock, spliting back into two separate individuals. In the electrical flash, the twins however, recover before Braeden and Isaac regain their senses.
They arrive at the school parking their F3 motorcycles in the school parking lot, then walk the walk through the school hallway. Together the two spot Braeden talking to Allison Argent and Lydia Martin.
Ethan and his brother rally their pack, then all five alphas converge together at the high school and corrall Braeden into the locker room. They collectively attack the mercenary eventually bringing her down and leave her to the leader.
Ethan is seen having friendly conversations with Danny in the library. Later, we find out that Ethan was originally only friendly with Danny to see if he was a possible threat to the Alpha pack's plan.
Ethan and Aiden attack Isaac at school. They then frame Isaac for attacking them. Scott McCall and Isaac mess with their motorcycles and the twins merge into one to take them on in school. They stop when Deucalion shows up.
Ethan is sitting with Danny on a road trip with the cross country team. Throughout the bus journey, Ethan keeps checking his phone. He says that he has a sick relative that might not make it through the night, referring to Ennis. Flashbacks throughout the episode show the Ethan and Aiden in merged form fighting for the Alpha pack.
Ethan pairs up with Danny for rooms. The are making out when Ethan starts to hallucinate. He leaves the room to go and kill himself. Stiles, Lydia and Allison find him and stop him. The next morning, he tells Scott that he thinks Derek is still alive. He also says that the Alpha Pack blame Derek for the death of Ennis and say that he has to join their pack or be hunted down by Kali.
Ethan brings Danny to the hospital when he has shortness of breath and chest pains. While at the hospital, Ethan admits that he and Aiden went after Lydia and Danny because they knew one of them would be important to Scott. Later, Ethan and Aiden hold Jennifer Blake captive at Derek's loft. While there, they help kill Boyd.
Aiden tells Ethan to stop seeing Danny. Ethan reveals the twins past to Stiles and Scott; the twins were the Omegas of the pack, they were always the last to eat and first to be abused. Deucalion found them and taught them how to merge together. This allowed them to eliminate their pack one by one until they killed the alpha together, making them alpha's. Ethan and Scott then stop Aiden and Cora fromfighting each other. At the end of the episode Ethan and Aiden are seen at the concert.
Ethan and Aiden along with Deucalion and Kali hunt down Ms Morrell.
Ethan goes to the animal clinic to ask Lydia for help to stop Aiden and Kali from killing Derek. The twins merge together and try to fight Jennifer in Derek's loft. Jennifer breaks their necks. They survive thanks to Deaton, although they are no longer alphas. They also lose their ability to merge together.
Although Ethan and Aiden are not alphas anymore, Scott seeks them out to help him control his werewolf side. They teach him control and to not be afraid to unleashed it when necessary.
Ethan and Aiden attempt to join Scott's pack. Scott turns them down. The help Scott and his pack find William Barrow.
At Danny's Halloween party. Both Aiden and Ethan are marked by the Oni.
Aiden and Ethan try to gain Scott's trust by offering protection. They help protect when the Oni show up at Scott's house.
Ethan and Aiden help Scott find Stiles. Ethan tries to save Danny from one of the Nogitsune's trap by tackling him and kissing him in the woods.
Aiden and Ethan help Scott find a scroll that belonged to Silverfinger.
Ethan says that he and Aiden might not stay in school. They become controlled by the Nogitsune and fight with Issac, Allison and Kira.
When Ethan and Aiden are trying to find Lydia, they are shot at with Wolfbane bullets. They are saved by Derek despite being hit several times.
Ethan and Aiden want to run, but Derek convinces them to stay. Aiden is killed. Ethan decides to leave Beacon Hills, California. While breaking up with Danny, he says that he knew Ethan was a werewolf the whole time.