True statement here.
I'll admit, I'm actually unfamiliar with most of the characters in Smash as it is, both first and third parties. Just because I don't know a character directly doesn't mean I won't like them - Ike's one of my favorites, and I've never played a Fire Emblem game. But I will admit that it does make it harder to care about characters you're unfamiliar with as well, especially if the character is from a genre/artstyle you don't really like in the first place or doesn't have a stage/music you find appealing.
I remember back in the Brawl days, I was very against third parties in Smash, with the exception of Sonic considering they had so much history together. Even in the early Sm4sh days, I was still pretty hardline on that. And then we got the DLC.
Now, my #1 most wanted of all time is a third-party, and kinda in the same boat as Terry - really not talked about at all, despite having a huge legacy on its own...just not in terms of the Smash fanbase.
Kinda brings up an interesting game to see how well-versed you are in the characters of Smash. List out all of the characters, and just identify whether you've played one of their main-series games, 'played' here meaning more than a few minute demo. Or do you really only know them from spin-offs? Or is Smash the only place you've ever experienced them? And this is just for fun, not a way to say "I've experienced everyone so I'm better than you," or "You haven't seen them at all, your opinions are trash."
I know that I've always been one to stick with what I know most of all, so I expected I'd have a pretty low rate of experiencing the characters first-hand. Still, there are some characters I've never played outside of Smash that I like and some I don't.
I just really need this rollercoaster to end...