Elfangor

Elfangor is an Andalite from the Animorphs continuity.

You can't see me!

_{This character has no official visual representation in any Transformers product or media... yet, at least.}

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.