Gray is a character from the Fate series, debuting in the Lord El-Melloi II Case Files. She is a young woman from the Add family of mages in Wales, trained as an assassin due to her reaper-like appearance and scythe-wielding skills. Raised in isolation, she idolizes her 'Lord' Waver Velvet (Lord El-Melloi II) and serves as his assistant. Self-conscious about resembling her ancestor Add the fangless reaper, she hides her face with a mask and hood. In Fate/Grand Order's LB6 Avalon le Fae, she becomes a key figure as a calamity fairy with immense magical power, losing memories but retaining her heroic nature. She pilots the mecha Add in combat and bonds deeply with allies like Ritsuka Fujimaru.