Born in Jehanna, Ewan is a sage-in-training with much potential, according to Saleh. He is the third and final Trainee unit, more exactly a Pupil.

In Eirika's route, Ewan is seen in Carcino, where Pablo starts a coup and attempts to find and kill both Innes and Klimt. Tethys has Ewan stay in the local inn until the battle subsides, much to his disappointment. After Pablo and his army is routed from Carcino, Ewan introduces himself to Eirika and offers her a way into Caer Pelyn, which she accepts.

On the way, they run into an abandoned fortress, which has been overrun by monsters. Ewan attempts to participate in the battle, but is either told by Innes or his sister to stay out of the battle, which annoys him. After disposing of the monsters in the fortress, they reach Caer Pelyn, though monsters quickly attack it. Ewan is chased by a Revenant, though he manages to escape by entering a house. He later joins the party as a permanent member upon visiting the house he is hiding in.

On Ephraim's route, Ewan has Saleh drop him off at Taizel, so that he can speak to Marisa. He heads into an inn to find out where Marisa is located. Upon visiting him, he joins Ephraim's forces so he can speak to Marisa. If he does so, Ewan tells Marisa that the mercenary guild had a mix-up and asks her to join Ephraim's group so they can find Gerik, which she agrees to. If Ewan speaks to Saleh in Scorched Sand, he will be relieved to see his teacher again.