Maybe I should do that. Write out what I want in a character...let's see
-at least average mobility, but preferably above average. There hasn't been a slow top tier in smash yet for a good reason.
-reliable grab (tbh, how i gravitated to pac-man, i can't explain)
-good gtfo moves because i (and everyone) will make mistakes from time to time
-good boxing game, because in general you will be in the opponent's face a lot
-moves that are favorable to throw out with the intention of trading/attacking over dodging, or moves that have good value off of hard reads (ie meteors)
-if i lose with the character, i feel like it's my fault and not that i'm being held back in some way
-i can use the character in teams without changing my strategy much (nope, still don't believe in the doubles Pac)
Viewing Pac-Man as an exception, it's no surprise that Mario is my second most used character, then Falcon follows. Mario is straightforward with no big tricks or anything, except the hidden depth that's in FLUDD. I know exactly what I need to do when I'm playing with him, and he doesn't have any glaring weaknesses that hold him back significantly. He has his smashes and fair for when i want to be aggressive/ go for hard reads; good combo breaker Nair and up B; great grab game; everything i want in a character, honestly. Sometimes I get annoyed when people wall me out as him, but that's probably on me: he has a projectile and a good zone breaker in FLUDD. I think he's a good character and top 10 at least.
Falcon has awful gtfo potential and disadvantage, but I like his mobility and clutch factor (combos, knee, meteor) enough that I bear with it. I can be down the entire match but make 3 critical reads and win just like that. With his mobility and raw power, it's not hard to condition or scare people into mistakes either. He does get pooped on by sheik, so i doubt he'd ever become my primary character. Also, a lot of people don't realize how valuable being fast on the ground is when you're feeling pressured. A large majority of characters in this game can't punish Sonic/Falcon/Mac/Fox etc. with something lethal for running away when they feel like they're under pressure, and they're fast enough to turn right back around and punish you for attempting to do so. Running away > rolling IMO because you have so many more options, assuming you're a fast character.
I'd probably get by fine in this game with a combination of Mario, Luigi, and Falcon. Luigi is slow as balls, but I think he beats MK, and MK seriously annoys me as a character.