BUR #4555 has been approved by @evazion.
create alias teodor_(persona) -> theodore_(persona)
Theodore is the correct way to spell his name, as it's been officially translated as for over a decade. Danbooru is one of the two sites to still use "Teodor" 11 years after the English version was released.
"Theodore" also falls into the naming scheme of the rest of the Velvet Room attendants, as they're all named after Frankenstein characters (After Theodore Bohmer from The Ghost of Frankenstein).
Sources:
https://youtu.be/9Kv7PTqzZHI
https://youtu.be/ugo8vIBFVMU
https://youtu.be/79pBpbhi5i8
There's even Japanese sources that don't use the "Teodor" spelling, showing that it's not that common even over the pond:
https://static.myfigurecollection.net/pics/figure/large/227469.jpg
https://static.wikia.nocookie.net/megamitensei/images/1/12/SnK_Theodore.jpg
https://cdn.otamart.com/item-picture/27086064/0-1584473188718.jpg (One letter off, but the point still stands)
https://i.imgur.com/S8Fesp7.jpg (Hard to see, but there's definitely a letter at the end)
Updated