[MangaArtist18]

A special weapon to make it stand out.
I don't mind a hero using a previous form's weapon (Full Bottle Buster, Gashacon Keyslasher, Saikyo Girade).
But I feel like a form that's the strongest in the show should get some special weapon that helps it become even stronger; even if it's used mainly for the finisher (i.e. Cosmic States' rocket sword).
I really miss final form weapons.

Cool design.
I'm easy to appease in this case.
EDIT: To clarify, I don't care if they're sleek or bulky, flashy or subtle. It really depends on the show's aesthetic and the form(s) that came before it.
For example, Maximum Mighty X is bulky, whereas Muteki is sleek; Double Xtreme and Drive Type Tridoron play on their main themes (what if Double became triple; Drive's used a bunch of cars, but not Tridoron).
For Zero-One himself, I'm expecting something gold. Hoping for a special weapon, but if he uses MCH's combined blade, that's fine too.

Cool powers that it uses often-ish.
Wish Fourze Cosmic States used its switch-mixing gimmick more, but at least it did it more than Build Genius.
Mugen has, like, seven finishers, which is super-cool.
Muteki cannot detransform unwillingly (i.e. rider gets punched hard and the suit disappears; not the case with Muteki).
Genius can use/combine bottle abilities, though it ditches that (only using Diamond twice) for abusing the heck out of its flash-stepping power.

A cool henshin gimmick.
Putting a device in and everything is cool, but I like things like Hyper Muteki or Meteor Storm because of their extras (docking to cover center screen, and BEYBLADE BEYBLADE LET IT RIP, respectively).

EDIT: To include one of my own ideas, this is the final form for an OC of mine.
The suit itself is a lot more elaborate than his previous forms, including tons of speakers and wavy tech lines.
And the helmet looks like that sound wave representation (bouncing, synchronized, colored bars) I find associated with music.
The henshin device is a giant egg that slots another egg inside; seeing as how his gimmick is egg timers (long story), I saw it fitting.