Ah, there you are. Clever girl.
Clyde Sallen is a resident of New Orleans who was reported to have died in 1928. He helped protect Ahmose and Sadie from witches and guided them around New Orleans, transforming into different people.
He may have powers, like Felicie Mirepoix, and that allows him to transform, fooling people into thinking he is dead, or he may actually be dead and is just coming back to help Sadie and Ahmose. Given how a waitress says that Clyde died in 1928, the latter seems more likely.