Given the number of different animations, 20 would indeed be ok. Something bothered me though so I quickly went through the updates he gave us so far to make a very rough count of how many enemies he already showed to us, be it in depth, with name, or just briefly. Whenever I was unsure whether a picture of characters was a unit of two, like the angels from Parade Buster, I counted them only as 1. Whenever I could not completely rule out that a character was not just a variant of an already shown character because they had a somewhat similar pose or weapon, I would not count them, I did not count young variants, like shown in one update, either, to get as low as a number as reasonably possible.
Well what do you know, I still arrived at around 20 already, with the game most likely being released in 2021, at least half a year from now. So that would mean he showed us basically the entire roster of the game already, or very close to it if we assume I counted two or three too many somehow. Ima go out on a limb here and say that is pretty unlikely, so I guess it is more than 20 total different characters for the game. The next few updates should make it more clear, if there is more new characters appearing then we know it for sure.
