So, rather recently, a romhacker named Fauntleroy created an improvement hack for Phantasy Star III (called Phantasy Star III General Improvement) to try to mitigate at least some of the flaws in the game and just generally teak things to provide a smoother experience.
The main gameplay changes include things like rearranging the contents of shops and chests as well as giving new party members better starting equipment in order to cut down on backtracking, and even improving weaker characters and some equipment overall to keep things on an even keel. He has also reintroduced enemies that were in the game data but were dummied out of the final release. There are also a bunch of other, more aesthetic changes, like bringing enemy and technique names back in like with the rest of the series (Gires has been renamed to Sar, for example). He has also added a bunch of NPCs to populate all of the empty houses and they all have something to say, and the script has been expanded to add player character responses to NPC dialogue. In fact the entire English script has been somewhat rejiggered, but mainly towards an eye of filling in holes in the original English script and is generally done with a much more deft hand than Numan Revolution.
So, it still feels like it was localized in the '90s, but better '90s, not early '90s.
As I finish each generation, I'll leave my notes here.
First Generation
-New opening crawl! And better written! And actually ties it back to the previous games!
-Knives are quite improved. Which is good, because you don't start with enough cash to buy the first Sword right off.
-Mieu starts with two claws this time. And she and Wren are properly called Androids.
-"I've never stolen anything!" Suuuuure, Lyle.
-It's way more worth it to go out of your way for chests- Mieu's first claw upgrades are found in a couple.
-Wren actually has armor and a gun when you get him this time.
-Miun's crazy talk is much longer this time. But I'm always up for some prime prophetic babbling.
-Apparently this time Lyle tried to order Wren to fix the weather, but Wren disobeyed for obvious reasons, so he decided to lure Rhys out there to get Wren to do his job.
-"I am programmed to be polite." Makes me wonder what Wren would be like if he had a choice.
-The weather station has been renamed to Climatrol. It's also still the best grinding spot in Generation 1.
-The reason Lena is in Shushoran Castle this time is because she tried to chase down Lyle to get the Sapphire back, so he knocked her out and dumped her back home so she wouldn't pester him.
-Rhys actually remembers that Lena is his fiancee on his own this time. It took him a minute, though.
-Shushoran Castle gets pretty populated after you gutpunch Lyle. Plenty to talk about.
-Lena has up to date equipment. She may need a second knife, but that's fine, because knives are good now.
-King Cille doesn't call Rhys a spy, but instead puts his life on the line to keep Rhys from marrying Maia, daring him to kill an old man in front of his only daughter.
-King Cille articulates Rhys's choice in a much better way- As the people of Cille would never tolerate a distant king and he'd never allow his daughter to go to a land where people would think of her as a monster, if Rhys wanted to marry Maia he would have to stay in Cille. But if he couldn't bear to abandon his homeland, he would have to leave this country and go back to Landen to find someone else to marry.
So, I'm taking Lena's/Nial's route next. And I'll let you know when I've done Gen 2.