First row: Mimi, Dimentio, Toad, Fawful, Toadsworth, Kammy Koopa, Kamek, and Nastasia; the short kids.
Second row: Mario, Wario, Luigi, Mr. L, Princess Peach, Princess Daisy, Prince Peasley, and Waluigi; the "normal" group... all about 5-feet-something tall (though Waluigi is pushing it...)
Third row: Tatanga, Count Bleck, Princess Shroob, Wart, and of course Bowser; the tall and/or huge group.
All of these were made from scratch in MS Paint because I was bored. They're double-sized on here so you can actually see them without squinting.
And of course, those aren't the "official" heights in any way (if there even ARE "official" size comparisons in the Mario universe)... they're just how big I imagine each character being in comparison to the rest. The only ones I think might be a little off are Waluigi, Princess Shroob, and Wart; if I ever re-did these I might make Shroob a bit smaller and Wart a bit bigger, and Waluigi taller (I forgot to account for the fact that he never stands up straight, he's always walking with his legs bent funny... so I guess his height here could be "how tall he looks when walking with his legs like that" and his real height would be somewhere around Bleck/Shroob/Wart.)
Other than those three, everyone's at pretty much the perfect size for my version of the Mario universe.
And yeah, Tatanga is based on the comic book version, because there are literally NO good game-derived pictures of Tatanga's full body... just his head and hands, and his ship(s).
EDIT: Toad's vest is now blue, like it should be, and the back part of Bleck's cape-collar-thing is actually shaded some now.