Damian and fragrance
So IDK if anyone else head canons this but imma share it anyway.
I head canon that Damian is extremely particular about fragrances and hygiene. Not in the he hates perfumes and such. But more in the it bothers him very deeply to be around cheap smells and cheap soaps. Because of his deeply Arabic roots and the routines that he grew up around with Talia and Ras Al Ghul who both took fragrance and cleanliness very seriously. So perfumes, colognes, soap and laundry soap are something he's extremely particular about.
So I just picture 10 year old Damian going with Cass, Steph and Babs to go buy perfume and body mist. But it's not what Damian is used to and due to the fit he absolutely had. He can only go fragrance shopping with Selina because she gets it.... Babs, Cass and Steph each end up getting new perfumes every time he goes with her. Because he sees them as family and despite how he may act at times he does genuinely care and believes they deserve the best.
.... The day he saw Tim using something like axe body spray.... Ooooh boy was that a tantrum from hell. Now Tim has like 8 different colognes. Some different soaps and a whole new laundry detergent. Because Damian refused to "let Drake embrass the family."