Great Combos: Kirby's punish game can be very terrifying, since they can turn most stray hits into 60% combos.
Amazing Normals: Kirby has some of the best tilts in the entire game, since they're very fast and generally safe on shield (which is kinda rare, in Smash). Their aerials and Smash attacks aren't too shabby either.
Low Profile: Kirby has one of the best crouches in the game, which allows them to low profile most common options or make landing aerials safer than they should.
Great Edgeguarding: Thanks to their 5 multi jumps and rather floaty aerial movement, Kirby can easily edgeguard their opponents.
Adaptability:Inhale (neutral-B) allows them to steal the opponent's Neutral-B. Depending on the opponent's character, this can completely turn the tides of the MU
Platforms: Ironically enough, having a platform near them totally ruins their punish game and damage output.
Struggles to Land: Due to Kirby's floaty nature, getting out of juggles will be more difficult than with other characters.
Struggles against Zoning: Kirby lacks any kind of ranged attack. This, on top with generally aerial movement, makes Kirby's approaches very predictable.
Stubby Moves: None of Kirby's attacks are disjointed. This, coupled with the two previous cons, makes sword characters some of Kirby's worst MUs.
Relies on the Opponent:Inhale's strength entirely relies on which character Kirby is facing. While it can net them some of the best moves in the entire game, it can also give them some very useless ones.
Dies Early: Kirby is tied with Mewtwo, Olimar, Pikachu and Sephiroth for being the 6th lightest character in the game.