More people prefer Richter over Simon? Begone, you don't belong in this world, monsters!
Just kidding. Richter looks good, but I guess I just love that classic, rugged barbarian design that Simon has.
I guess that it's a classical case of the Mario/Luigi Sydrome, the guy who got the first and subsequent most apperances and significant roles total is gonna leave more of an impact/impression than the rest obv.
But than there's the ever expanding camp and ship, which is way more loyal partial to a character simply, due to his personality and flair as well as generally being way more developed to better distinguish himself from what came before.
So based on these attributes,strengths and traits, it's easy to guess who newcomers/newbies to the series are gonna gravitate more towards.
Though I have to say, based on how Simon was presented in his games, with the latest being Super castlevania(4) if I am not wrong, it's kinda amazing how iconic/striking his Smash debut ended up looking. Bc let's be honest, aside from the terrible/generic box/cartridge art, there's pretty much nothing to go off. Really the first thing that comes to my mind, in contrast to Richter, who was the first to receive legit cutscenes and voice lines and such which made portraying him the easiest choice, for poor old Simon is the bane, achilles heel of most Belmonts, their knockback and in his case the stupid "hiccup" sound, he made before falling down a Pit!!!