Mechanically, I feel like the Stardust set bonus could use some work. I understand that it's supposed to keep enemies at a distance, but it just doesn't seem all that effective at its job. I want to say "increase its range", but at the same time that doesn't really go all that well with the JoJo's Bizarre Adventure motif they seem to be pushing (those who know how Stands in that show work will know what I mean). Personally I think it would be cool if you could activate the guardian the way you do normally, but upon doing so, your character's movement speed is slowed noticeably. When enemies get up close in front of you, the guardian starts punching away (ORAORAORA). The punches wouldn't do much damage (so as to not take away any limelight from melee), but the knockback would be spectacular; on par with the Slap Hand.
Aesthetically, I don't like the Solar Flare shield very much, and I think it would be cooler if the set bonus showed up as some kind of fiery Super Saiyan aura outlining your character.
Yeah, I'm very anime-inspired, I know.