I go with characters from Super Mario, eg Luigi, Bowser, Yoshi. I like them because they’re short, easy to type and memorable.

In case people don’t know, https://namingschemes.com/Main_Page can be a good source of inspiration.

I used rclone to get all my photos down, then I used Immich’s bulk import API to get everything into Immich just yesterday. I did about 14k photos.

Take note of the limitations of rclone though, it won’t get the original full resolution - https://rclone.org/googlephotos/#limitations you need to use Google Takeout to get full resolution.