A minor skill detail: Cracks.

[Own]

This falls under 'It'd be cool but not really necessary', but it would be kinda neat if the lingering crack effects Luke causes during his boss battle were applied to a few player skills at gold charge level, anywhere in the game world. Something to give a sense of weight and lingering impact to the skills.

Meteor, Earth Spike, Frosty Friend Smash and Heroic Slam all seem decent candidates.