The character uses he/it pronouns, but anyone may audition

SPECIAL NOTE: Apollo is not the name of the character. To avoid spoiling the show, the name of the character cannot be revealed at this time. If cast, the identity of the character will be revealed to the voice actor.

Apollo has a very specific goal, and he's going to achieve it. This may put it at odds with the other residents of the Academy, but Apollo doesn't mind as long as he is allowed to continue working. While his voice is not deadpan, it's very calm and collected. It speaks in a confident manner and is very charismatic when he wants to be. 

Much preferring to be a leader than a follower, Apollo always wants to strive toward making things better. He wants everything neat and in order, and while he doesn't always play well with others, he understands that having people who care about you is important. It wants to make sure everyone is safe and cared for, and he will help others reach their goals just as they help him.