okay
i do play good Ness', I've beaten FOW before, Ness does not have a better grab he has better throws, but not a better grab, any quick advances can be quickly stopped by just a standing grab from Lucas because of the much better range, this means Ness has to setup for a grab, PK Fire's out of the question because of Lucas' good projectile options, and he can't waste a jump trying to edgeguard because his up B will be instantly absorbed by you. Also, don't play footsies, Lucas' footsies is terrible and is only used when the opponent approaches, something that can be shut down by pk fire and snake, idk man.
I main Olimar, the red pikmin don't really matter, although they can't die to pk fire, you usually only see Reds being thrown if Olimar has a bad group like Yellow Purple and Blue, or Red White and Blue (lol), but yeah, also, white pikmin are the easiest to bat because there's no timing, as soon as he throws it you can bat it, the reflect hitbox of the stick is near instant.
Little Mac: Little Mac is the easiest for me because his ground game is amazingly good yes, but you forget to take in account that Little Mac can literally not miss any attacks because of Lucas' grab. Any tilts or smashes can be easily countered by a shieldgrab, especially if you've mastered perfect shielding.