The characters that I would truly hate to see in Smash Dojo (as playable characters) are Pichu and Plusle & Minun. I'm not too much of a fan of Pikachu and have some dislike to it but Pichu is my most hated Pokemon ever. Before Melee was released, someone suggested Pichu should be in and I flamed the poster for that. When I found out that cheap piece of **** was in Melee, I was mad. I have hated the Pokemon even more. Plusle and Minun remind me of Pichu in every way which is why I despise them too. There are so many unique Pokemon in that would make a great playable character. Look at Heracross, Scizor, and Pinsir. Look at Machamp, Poliwrath, and Nyuura (Sneasle). There is no reason to have another electric rat. Smash Bros doesn't need one.
I also do not want alternate versions of the existing playable characters. That means no Paper Mario, Wind Waker Link, Shadow the Hedgehog, Fusion Samus, Blood Falcon, etc. Zero Suit Samus and Sheik do not count since they are part of a character.