The OS didn't have story arcs either. Story arcs were never introduced to Ben 10 until Alien Force.
Chromastone can't shoot diamonds
They are based on Generic gray aliens. Gray Matter's original concept artwork literally was a generic gray alien.
I don't think so
I liked how all the S1 episodes aired together. I was also more amazed and surprised and loved the character development in season 1. Season 2 was alright, but not as good as season 1.
Diamond Head could probably win by trapping Chromastone in crystals.
I personally don't think Ditto is smarter. Each clone of Ditto seems to have a mind of its own. In their first appearance, they were arguing with each other. Echo Echo's clones are pretty much the same until Ben splits into a human with all of them. They fight in unison, so they have the same brain power. They won't argue, they work together.
I'm not sure since I'm American, but I remember it aired during the Ben 10 week on 10/10/10 (October 10, 2010) or the week of that, along with marathons of the Original Series, AF, and UA.
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I'd just go Atomix and hit him with a big blast.
The Omnitrix aliens
That would be cool for Ben to have
My favorite would have to be Ultimate Echo Echo.
May I ask how old you are?
I think Swampfire would win by using his sleeping gas. Other than that, it'd be a stalemate since Swampfire can regenerate limbs and Four Arms is fire-proof.
I can't agree with that when Ken has master control
2 because I like those aliens more and they are more useful.