YoshiandToad
Smash Hero
This. This exactly. I don't know what Emily considers excitement worthy, but it's vague.Well she didn't reeeally give us a ton of information. And whether the roster makes you "jump out of your seat" or not is entierly subjective.
Not to mention the moment a character gets in MOST people warm up to them instantly. Pac-Man had a very anti hype hate base around him prior to reveal, but the moment he got in those people 180'd and claimed he was a wonderful addition truly deserving of standing alongside Sonic and Megaman as a gaming legend.
Everyone was excited for Takamaru(despite the common complaint of "too many blue haired anime swordsmen" which always made me chuckle) and Duck Hunt Dog was laughed at as a stupid idea...then BAM, everyone's hyped about him and he's always had fans.
Rosalina was considered the least likely and worthwhile Mario character placing consistantly after Bowser Jr, Toad, Waluigi, Paper Mario, Geno and even Daisy and Fawful at one point. She gets in, everyone's hyped and talking about "of course she deserved it more than those other characters" despite the polar opposite being stated prior. Rosalina fans suddenly popped up everywhere.
Any character is going to make people hyped upon reveal.