Personality:

Axis is an ancient warrior of legend from centuries long gone. He was the very 1st "User" and is also the most powerful of them. His strength is beyond compare, even rivaling the gods that blessed him with his power to begin with. He strives to gain more and more strength, even after his passing so he can be the ultimate protector of all. This has made him develop a cold extrerior to all but those that are closest to him, his fellow "Users."

Axis is the mentor to the MC, Vizor. He trains Vizor in using his power so that he can carry on the legacy of the "Users." How he does his training with the young dragon, is a lot more destructive and painful then you'd assume, believing the only way to truly gain more strength is to battle and develop the skills you learn in said battles. 

Personality:

Axis is an extremely cold individual, brushing off a lot of things as annoyances. His only care lies in gaining strength and battle. Which is why he'll glady leap into a duel with his fellow User's if they challenge him, even if he knows he's going to win. Aside from that, he spends a majority of his time honing his skills, mediatating, or training Vizor. 

That's what he'd want you to think at least, but underneath his tough exterior is another old man with a loving, warm heart for his fellow User's. He views them all as family to him and respects them all, despite the discrepency in strength between the 6 of them and him being extremely large. He just hides it all under a confident, precision-focused, cold extrerior. 

Voice:

The ideal voice in my head that I have for Axis is something in between Rufus Jones' voice for Dunban in Xenoblade Chronicles and Dan Southworth's voice for Vergil from DMC. What I'm imagining is Axis essientially having a Recieved Pronunciation British accent with the same speech patterns and inflection as Vergil from DMC.

You can still feel free to experiment with the voice ofc!