RE5 more like RE4. Restore the inventory system, make Sheva an alternate playable character rather than a nuisance and drain on resources. Cut down on the intrusiveness of the cutscenes: no Capcom, I don't give a flying crap about your cutscenes or the award-winning story you're trying to tell, I wanted to loot the area I was in but your cutscene interrupted that and then transitioned me to the next area meaning I missed out on potential loot.

For the Senran Kagura series, take out all the censoring flashes of light and chibi faces.  Replace them with nipple covers such as:

or...

Final Fantasy
-Scrap XIII. It was a disaster.
-Make MMO titles a spin off series instead of XI and XIV. Basically only a very few amount of people can say they beat all 15 games... And that's only until the release expansions for their MMOs.
-The battle system hasn't been good since XII. I'd change it back to turn based. Lost Odyssey style maybe for a bit more flash.
-I'd have finished XV before releasing it.
-bring fantasy back as the core focus of the series. I'd still do a sci fi title here and there, but get back to its roots.
-release Crystal Chronicles: Crystal Bearers 2, but that would have been years ago for Wii U. Telekinesis being controlled through the gamepad and added weapons to equip.

I figured you'd respond to my post, but i didn't think you'd take that long.  Oh...... you were doing researching.  "Nipple covers" you say?  Got ya.

LoD

- make it an fps
- add competitive mp
- add big bulky muscle head good guys with lots of guns

:p