> The idea of sending a header to remember a tech person is a great one, but I think the name should be something neutral, or something that has some relation to the person and not a random fantasy reference.

You made me laugh - this has 'old man shakes fist at cloud' vibes, which is concerning as it seems we are about the same age!

If you wanted to add a header `X-In-Memorium` to any site that you control, go ahead. If anyone adds `X-Clacks-Overhead` to their site, its not going to affect you.

The My Little Pony thing seems, from an outsiders quick look, like it does meaningfully affect other people.