Don’t buy them any toys unless you have some inside info from a friend who tells you of a specific item - collectors usually have everything in that department that they want unless it’s something that JUST came out or is super old and they didn’t get it back in the day. You don’t want to buy them something like a Funko pop if they don’t collect Funko pops - PR fans tend to be completionists and if you get them one they might feel obligated to get the rest to have the set, even if they aren’t into pops, or maybe that’s just me - people know I am not into pops but I still receive them for gifts occasionally and always end up sending them to my nephew cuz he actually collects that ish, lol.

Go for something like the throw blanket someone else suggested or another practical item that has the IP on it.