Gray has a laid-back personality but will get serious when the time calls for it. He and Natsu have a friendly rivalry, and while they can often be seen fighting one another verbally or physically, the two are actually quite concerned about each other. Gray was quite obstinate and reckless when he was younger, but over time, he has attained a more cautious attitude towards life and deals with problems carefully. He is very concerned about his comrades and is truly loyal towards his guild, but tends to trash talk every now and then. Also, he has a disturbing habit of unconsciously removing his clothes (including underwear) at inappropriate moments. Also, Gray is quite skilled in acting as an evil person, as shown in year X792, when he infiltrated Avatar on Erza's request, something that manages to prompt Briar to remark Gray's desire for "revenge" against E.N.D. has stained both his soul and skin.