Questionable Questing

Just anime setting with these hax reality bending magicians with sophisticated techniques and on other side are warriors pumping mana like steroids to make bigger thunder sword slash

Math nerds versus steroid jocks. lol. Magicians who use their powers to constantly shift space around, attack in all angles and degrees with a complete disregard for physics. Versus warriors pumping so much magic they can shatter congregate when they jump and cut faster than the human eye can blink.

Different elemental and concept magics vs Black iron dragon, sky titan spear, glacide Phoenix swords. Organizations pairing the two types together as partners

You should make the jocks have a more philosophical bent, to where they see mana as a tool to purge the weakness and impurity from your body and become a higher better form of yourself. With maybe a little biological manipulation too as the mana causes changes to your body, like bigger lung capacity or more twitch muscles for better reflexes as it reinforces and upgrades you the more you use it.

I like the warriors being philosophical about transforming the self while the magicians see it as a tool to manipulate the world

Furthers the nerds versus jock comparisons too since it's spiritualism versus logic.

Now for a actual setting

That's the hard part. lol. It's why there's so many over power Harry Potter or Naruto stories. The powers the easy part it's integrating that with a whole world and compelling cast of characters.

Indeed

Well I guess the first question is Modern, Sci Fi, or Fantasy? Since the time period's one of the most important when deciding a setting.

Fantasy modern?

You going for a masquerade or try to more thoroughly integrate the fantasy stuff in the modern day?

Latter.

That just leaves power levels. How they compare to guns and modern militaries? How integrated and involved or antagonistic and independent are they with local governments? Stuff like that to figure out the relationships and logistics of the Masquerade.

No masquerade and I've never used guns

Oh whoops. Goddamnit. The world ladder is still tripping me up. lol. But if you don't want guns just make the magician anti physic's shield make them malfunction and have the muscle guy's strong enough to shrug off bullets even on the lower ends.

But you kind of needs guns not necessarily because they add to the setting, but if your doing a modern setting the creation and then innovation of guns basically help kick start the industrial revolution since it forced blacksmiths to have a higher tolerance for machining than ever before to achieve rifling and canons. Not to mention it basically helped create navel and mobile warfare as we know it.

Basically if you get rid of guns it opens the door for a lot of questions from the readers about the world building and history of this place and creates a bunch of work for you the author if your just trying to do your standard modern day fantasy.

I just want anime land. No strong ideas here yet

Fair enough. If you're going the more comedic route then just don't draw attention to it. Pull the Ramma card and have everyone respond with indifference to all the insanity. lol.