i have never watched doctor who nor care about it but i assume at least one is named henry
[Ignore the previous poll if you saw it; I wanted the poll to go for a week instead of a day]
Idea stolen from @sillylotrpolls:
Counting all media, and you may take as generous a definition of companion as you like. To specify what 'number of characters' means in this context, if one character has multiple names, (fr'instance Bruce Wayne/Batman) that character only counts once. Otoh, multiple different characters with the same title, (ex. Dick Grayson, Jason Todd, et. al.) might all be Robin, but they each count as separate characters.
As always, feel free to reblog for wider reach.