Jimmy and the Pulsating Mass Fandub
JRoyalVA for Coltrane
Coltrane is a member of the Legato Knights. He's pretty serious, but respects those who show strength and is honorable in combat. After the Legato Knights disband, he makes his way to an arena and battles there.
For Coltrane, I imagined he has a pretty serious, mid-pitch (or deep) voice. Nothing super specific here. Maybe a bit of an accent to him, but not required - just make him sound noble!
(Serious, a bit excited) "I've been waiting to face off against you, lad. Today, my blade will sing!"
(Thoughtful) "Captain Windsor is gathering the Legato Knights? I've been a knight without a master for too long. Thanks for telling me, lad."
(Respectful) "You're truly strong, lad. I've lived a good, long while. My sword song is almost over. May yours last forever."