The following judgement of Quicksilver come almost exclusively from the Empire Mag cover.
he looks stupid. Everything about that picture is wrong. As I said, maybe in the context of the movie it all looks better, but starting at his look, to his blurred look, it's all wrong. Let's just forget that he doesn't follow traditional Quicksilver look, he still looks bad as a generic speedster or a general character of any kind.
Hair = horrible - Grey hair... fine. Long hair... fine. Still hair while moving!? WTF that's lazy. I''ll assume that was a magazine photo shoot thing (the ear buds don't even look the same)
Outfit = horrible - they want to literally dress him in metallic silver, then fine, but dress him better, and I'm pretty sure he wouldn't be wearing a jacket (wind resistance/aerodynamics seem kinda important to someone moving at those speeds).
accessories = WTF? I get the goggles and the earphones attached to them (hard to see or hear with wind in your face and ears), but everything else on that belt...!?
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As far as why Jarvis is a computer... he's that way in the cartoon and I've never read an Ironman comic, so I don't know what else he was supposed to be. But it would make sense to have him be an A.I. to show Stark's genius level I.Q. to even be able to create something like that for his personal use and then to have them be able to interact with his suits. It all makes sense. It's well thought out and executed.
Why does Tony act more like his Ultimate self verse his 616 self....? why does it matter which version of the character the took more influence from if it makes sense in the world they are creating? They needed a Tony that audiences can relate to even though he is a billionaire genius playboy that flies around in iron suit.. It works, and it makes sense in the context of the created universe.
That is not something that I can say about Fox's Quicksilver based on the image up above.