oh, f*** yeah. Heigani would've probably gone unnoticed if Satoshi hadn't got it and it had such a funny persona.
The Kimori line, at first, I just kinda saw as just another starter, admittedly. I mean, it seemed a bit interesting, when the starters were first announced, that Kimori was breaking the mold of basic starters looking sickeningly cute, but that was about it. But it was Satoshi's sole specimen making it look a lot cooler than the game and Sugimori art led on. And I was anticipating an evolution for this guy since day one, so of course, I took notice of its evolutions as well and looked forward to their appearance, which Satoshi's again succeeded in making look cooler, thus, I grew to like the entire line.
If Sounansu wasn't there.... well, assuming it'd still be a popular Pokemon in Japan, I probably would've noticed it eventually when it ended up getting its own pre-evolution, and probably stumble upon the fact that it makes a pun in Japanese (much like how I learned of Usokkii's pun, even though it's not seen near as much as Sounansu). I probably also would've ended up taking note of it for its moveset, which I found a bit off considering every other Pokemon is capable of learning at least one directly offensive technique, even the cocoons when they evolve from the worms (on that note, I find Danbaru to be a pretty interesting Pokemon since its only move damages itself, which would make it quite a challenge simply to go around slaughtering wild Pokemon). Though, Metamon could be an exception if you happen to put it against an opponent that can't attack. But anyway, before Musashi got it, I really didn't pay heed to this Pokemon, nor did I know of its limited moveset.