Elfangor

Elfangor is an Andalite from the Animorphs continuity.

Prince Elfangor is an Andalite prince who sacrificed himself giving the Animorphs their morphing powers, in order to provide them with a sliver of hope against their encroaching enemies, the Yeerks, led by Visser Three. His younger brother, who joined the Animorphs, is Aximili-Esgarrouth-Isthill.