Yeah, I don't feel it for Isaac this time. A mere 3 minutes presentation is certainly for an autonomous character, without outside explanation nor new game. First or third party? I don't know. Pokémon, Waluigi or Elma would fit, as would Monster Hunter, Phoenix Wright, Layton, Dante, Ryu Hayabusa or a lot of other japanese characters. It probably is an unsurprising character, in the sense it is one that is already discussed a lot in boards; and probably not a western character (Crash, Doom, Master Chief, Lara Croft, LoL, Blizzard rep...).
I decide to expect a Pokemon so I won't be disappointed.
Honestly, I don't really expect Pokémon, but I'll vouch for that for now and
should not be more disappointed than that in the end.
After all, I'm still at the big number of
zero character I wanted to see getting in for now.