Riot, I love Galio's personality
https://www.youtube.com/watch?v=rJFip-XdMIw
After listening to all of his lines, it's clear to me that his character is that of someone that's been told what he is and what he's meant to do and he embraced it with passion and cheerfulness but at the same time he's started to realize the downsides of who and what he is but it has taken time since he's not awake all that often. After doing his job for as long as he has and with his only reward being to go back to sleep, it seems that he's actually sad about not being more than what he was designed for, but he still believes that what he was designed for is good.
Nay sayers may continue to say so but I think you did a good job with his personality. He's clearly enthusiastic to do good for Demacia but at the same time he still has a sadness that anyone he meets while he's awake won't be there when he wakes again (Except maybe Poppy? Yes? :D ) and that the only thing he has time to do while he's awake is to be heroic, defend Demacia, and be an icon for them to rally behind. So despite him enjoying his job, he's still sad that he can't be more or show the other sides of him.
I like it, I think you did a good job on re-imagining him.