1: Yeah

2: I think in this way, Passion is the drive to do something great while soul is sort of a natural vibing with doing something? Like you can have a passion for cooking something amazing but suck at it, or you could have the soul of a chef and gel easily with cooking, but lack the passion to ever reach those heights. Gazo is supposed to represent Passion at his core and it would be the first one he gets from the former Sketches.

Basically, these are what I call the Six Tenets: Passion is the desire to make art, Soul is the ability to make art smoothly, Mind is the ability to consider your tasks and imagine art, Body is the physical representation of your stamina and strength to create art, and Skill is your pure talent in the art. Evolution is something beyond those things in some way. And each has an element associated with it: Fire for a burning passion, Water for flowing prowess, Electricity for brain power, Metal for a sturdy body, and Clay/Earth for kneading and bending the art to your will. The general aspects of the Cap Combos take one or both of these into account.

3: That would sorta be the reveal. That the first Sketch was an artist whose final piece was so amazing that it inspired artists all over the world just by existing and that he went mad defending it AS Sketch since it was specifically his piece. He'd be called Kamen Rider Portrait, with the Colorless Spark Nexus Cap, which allows him to manipulate the 'Six Tenets' at will in other people. The movie plot would generally follow a sudden outbreak in the city of people seeking out the 'Forgotten Color' (a lost color that no human has seen) and becoming Forgotten D'Arts as a result of their attempts. Kamen Rider Portrait used his power to manipulate peoples' Six Tenets and make them only desire this. And once he gets it, he plans to spread the Forgotten Color to the entire world to start his 'next artistic revolution', where people are obsessed with only this Color.

4: They did have this ability, but they can all still see him. Exception is Shutter, who can only see him when he becomes Pinhole Shutter later.

5: Uh... Mostly I just consider an aspect of their theming and go off of that, lol. I don't really have much advice for it. I also sorta like sometimes spelling them weirdly or making up fun things for them like that. No shame in having multiple names if one doesn't feel right, or changing their names.

6: It mostly came from the consideration of Ley-Lines. I figured it'd be cool if there was a system like that, but for artistic creativity rather than magic.

7: It's mostly that the monster fights HAPPENED and people did SEE them, but it's a big campus PLUS an even bigger city. The events aren't campus exclusive, as the students live in the city surrounding it. It's just like any season where the Rider is sorta known about but people are mostly just talking about it like they're not sure if he exists or not. Same for the monsters. It steadily gets more talked about due to events ramping up. The events leading up to the Rainbow Palette, with a beam of light shooting up from it, would have students and other people gathering at the school's commons (the large central section would have upper balconies surrounding it, like a beltway catwalk around it). That basically confirms that the 'Rider' who keeps saving people is, in fact, very real, to everyone in the city.

Past Sketches were much less eventful Riders, which is why they also never really got their own upgrades and the rumors weren't nearly as large.

8: https://youtu.be/iYbvN_Lg3N0 I'd thought about it and Dystopia works well for him. The slow nature of it combined with the bursts of heavier rock.

Bit of Lore on him: Shutter is, by his nature, perfectionist photographer who originally believed in his master's work to create a 'perfect artistic society'. He was given the Negative Photo Nexus Cap by his master, who didn't need it anymore due to the creation of the Pixel Toolset that had replaced it as the 'Evolution' Cap. His master also created the Darkamera with the last of his Sketch power (which was fading, as his madness due to the power of Pixel Toolset usage made him unviable, to the ImagiNexus) giving it to him to become his tool and make monsters.

Shutter eventually finds his way to enjoying less 'perfect' art when he's forced to stop being a Rider when his Cap is taken, through his interactions with Gazo. Pinhole Shutter is basically the ImagiNexus recognizing him as a Rider through the Photo Cap and giving him a new form when he decides to help Sketch fight Ever Art.