A gentle and sweet-natured soul, Tails was initially timid and lacked courage. After meeting Sonic, however, Tails has become more confident, eventually growing into a more outgoing, brave and independent individual, and a hero in his own right. Since encountering Sonic, Tails has looked up to him and stood by his side, helping him however he can during their adventures.

As this comic starts right after Sonic Forces, I suggest going for a voice type similar to his VA in said game, Colleen Villard. Here's an example: https://youtu.be/9cPko9hFxJk?t=2m32s