If You could Add One New Character to Smash Bros, Who would it Be?

If I were to select a single character, it would likely be Tails or Knuckles. The primary reason for choosing one of these two is that Sonic is the only representative of his series in the game. Although he has two stages, his presence is not as prominent as that of the other characters, who benefit from additional supporting characters within their respective series. Including either Tails or Knuckles alongside Sonic would therefore be a logical and fitting choice, given that they are both integral members of Team Sonic. I would most likely add Knuckles since he is already in Ultimate. But if I could add both members, I would!

I think I will add Waluigi or Master Chef.

well im pretty sure if they did add DK jr diddy kong and DK jr will pretty much have the same moveset tho... like a clone, like dark samus and dr mario

DK Jr. hasn't used the same equipment as Diddy. They would probably give him more of an arcade based moveset, e.g. the barrels from the original Donkey Kong (even though he wasn't in that game).

Master Chef? What, does Gordon Ramsay just show up and start calling the other fighters a fucking donut or an idiot sandwich and start complaining about the state of the kitchen? /j