Hayate have a very calm and soothing voice. He's roughly 23 years old. The voice is a midrange-lower high voice. There isn't alot of reference I could show you without linking several different videos but this one does have his voice in it:

https://www.youtube.com/watch?v=V3I1zL_mLRw&ab_channel=SandKing

As stated before,You don't have to replicate the voice,just capture the mannerisms and tone. You can be a little flexible with the voice,esspecially since he's not a major character. Just make sure to capture the calm soothing tone and his chill/relax vibe.