I generally rather like Inkling in all regards, but there are 2 functional aspects of the character I dislike at present.

1. Their kill power is seemingly balanced around getting decades to charge smash attacks via roller. It feels nigh-impossible for the character's smash attacks to kill at reasonable percentages without first burying the opponent with roller. Burying is generally a bit of an unfun mechanic, and Inkling's weak smash attacks basically forces you to rely on burying to charge them. If I could, I'd change roller to simply floor opponents rather than burying them, in exchange for generally boosting the kill power of their smash attacks.

2. Splat Bombs have a habit of launching at unpredictable angles. I've had a fair few instances where a splat bomb explosion has launched the enemy towards the explosion's source. That's just generally weird, and makes them somewhat hard to play around. Other explosion's like Link's remote bombs don't seem to do this, so what's Inkling's excuse?

The former point is definitely beyond what would be changed in an update unless they suddenly decided that all buries are evil, but the latter point probably isn't.

Isn't Zelda one of the worst characters? I haven't checked a tier list in a while but I can't imagine she's gotten that much better

Ganon. Even though he's pretty fun to play (especially at low level), being an heavy clone of falcon just seems like a waste of potential to me, I'd like to see a new moveset for him.

Also Lucario, his kit seems so uninspired and bland.

Whether steve should be nerfed or not is debatable, but he sure needs to be fixed