One of the first characters you meet in Shadows of Valentia.. The rest is a quote from the Fire Emblem Wiki.

"Gray has an easygoing, chatty, and sometimes aloof personality. He comes from a merchant family and therefore is knowledgeable of the world outside of Ram [Village]. He does not have much self-awareness, however, often barging into conversations and being unconscious of how his own words come off to other people. Gray asserts himself as the tacit "leader" of the villagers and is very confident in his abilities. In battle, he adopts a gung-ho personality which is evident in his quotes and animations. Gray has also been shown to non-maliciously make fun of Alm at times."

Gray's english voice is Max Mittelman. https://youtu.be/4tr3F08iwv0?t=251