Concerns Regarding DPS Balance: Physical Ranged, Red Mage, and Summoner

[Lorika]

By adding Levi Shiva (We become icy white!) and Ramuh, we can have 6 clear level of mobility. 0 being "0 instant" and feeling the gap between all those.

Did you read your job quest and the lore of the job?
Because this imply you didn't.

The summoning process was created by Allagan, and everything you learn is based on it, and they mostly studied Bahamut.... At this point Ramuh and Shiva didn't exist.
But that aside :
- Shiva is impossible since it was created by ysaile and inhabited her soul. Shiva disapeared with her death
- Ramuh don't trust human, and he even consider them the reason of all the existing problem. When you beat it, it barelly acknowledge you and it's clear that at the first thing it consider mistake, it will take back the little trust it put in you.... And to begin with Ramuh is a protector, it protect the forest and it "childs", he doesn't care about going outside of it or anything else.

So no, bear with it : all you'll ever got are Bahamut, on which Allagan made experiment to create summoning magic before they empire collapse.