Elfangor

Elfangor is an Andalite from the Animorphs continuity.

Hiking really tires him out.

Prince Elfangor is an Andalite prince who sacrificed himself giving the Animorphs their morphing powers, in order to provide them with the ability to fight the upcoming threat, the Yeerks led by Visser Three. His younger brother, who joined the Animorphs, is Aximili-Esgarrouth-Isthill.