I picked Kirby during 64 cause me and each of my close friends had a "main" generally based around which games we had a personal attachment to:
one of my friends picked fox cause he loved star fox, one of my friends was a very casual gamer and only had a gameboy and pokemon so he played pikachu, one of my friends loved earthbound and none of us had ever even played it so he grabbed ness (lucky guy getting a somewhat obscure personal favorite in right from the start!), I had played kirby games when none of my other friends had (gameboy and super star on snes) they werent my favorite games but i had played them so i played kirby even though i was probly the zelda guy of our group but a lot of random people would play link back then as ocarina of time was THE game, and i wanted my main to be more personal.
When melee came out i stuck with kirby and he was terrible but no one was added that really peaked my interest besides sheik but i had another friend who was and still is super into sheik, has a sheikah tattoo these days, so i felt id stay with kirby and let him have his personal choice.
brawl speculation had me actively wanting characters for the first time and my most wanted have always been geno, little mac, and banjo kazooie. i held out little hope for banjo kazooie but the geno hype train hit me hard as mario rpg was a game i loved, had the strategy guide for it next to my bed growing up cause i loved just looking at the characters etc... and then punch-out was always my personal favorite nes game, i can still beat some of the boxers without looking and i always held it right up there with mario, zelda, megaman even though at the time punch-out!! had fallen a bit into obscurity...with pit in i thought little mac was a shoe-in. if either of those characters got in id finally have a main i could be really attached to. neither happened, though and i learned to enjoy toon link and sonic but generally stuck with kirby as he was my smash main from the start.
Finally in smash4 little mac happened and i got one of my most wanted characters! i was unbelievably excited when he was announced and mained him loud and proud. I was also shocked at bowser jr having the koopaling alts as i was a huge fan of them back in the day (probly would have actively wanted them if i had thought they were even possible) and actually disliked bowser jr for replacing them... having him get them in smash was kind of my big moment of forgiveness towards bowser jr as a character so its like it came full circle with him replacing them and then him being the reason they got in smash... so we are cool now haha. The other surprise was duck hunt which i didnt think would happen and if we hadnt gotten little mac and then the koopalings all in one game i might have chosen duck hunt as a main (say if we got duck hunt instead of game and watch in melee or instead of r.o.b. in brawl, i'd have probly picked him up as my main). So i got three potential mains in smash4 but little mac wins out to the point where i really dont play the koopalings or duck hunt, but they are certainly some of my favorite choices for character inclusions. i simply cant NOT main little mac as hes always been one of my 3 most wanted.
if Geno or Banjo-Kazooie happen this time I'll double or triple main them along side little mac, id feel a bit spoiled though honestly cause getting little-mac already really satisfies my desire for a main. I hope people get their most wanted characters in, ive felt that sting when little macs assist trophy was shown i waited years for another smash game etc... its tough and now im rooting hard for geno once again (same for banjo kazooie though i have less hope there) but if i dont get him, im happy with mac and just hope the overall roster is solid and most other people get their most wanted mains finally playable. inklings, daisy, and especially ridley is a very good start this time.