Taken straight from the first page that comes up from a simple google search:
site
And don't forget the 95% English patch by Truthkey. Here:
link to patch
Kingdom Hearts Final Mix features changes from the original version, including bosses present in the English version, but not in the original Japanese version. Other changes include recoloring Heartless and introducing new Heartless, new weapons, new enemies, new abilities, new cutscenes, Gummi Ship missions, new Ansem Reports, and a new secret movie.
The start screen was replaced with another drawing of Sora, hooded and holding a flag. On the start screen, a trailer for Final Fantasy X-2 is accessible, labeled as a "Special Movie" as a third option after "New Game" and "Load Game". The game has three difficultly levels, the first being Final Mix: Beginner. Final Mix: Beginner gives the player a Ribbon, an EXP Chain, 8 Power Ups, 8 Guard Ups and 4 AP Ups at the start, and neither of the secret movies can be seen. The Drill Gummi's Attack Power is 9,999, instead of 35. The second difficulty is simply "Final Mix", analogous to Standard from the previous game, but not the exact same. The Gummi Ship takes double the damage from the original version and damage inflicted by the player is cut by a third. The last option is Final Mix: Proud, a greater challenge than Expert from the original game. The Gummi Ship's attack is reduced further to a half, and damage is four times. A "Battle Report" is shown at the end.
Another new feature includes an Event Skip option, allowing the player to skip cutscenes already seen. Sora is modified to become transparent when camera situations force.
Bosses
Sora battling Xemnas in Final Mix
NeloAngeloAdded by NeloAngelo
The new bosses included "Unknown", who was introduced with no context and later revealed to be Xemnas, leader of Organization XIII in Kingdom Hearts II. Also added were "palette swap" bosses for the Olympus Coliseum: Destroyed Behemoth, Arch Behemoth, Red Armor, and Sneak Army. New to the Japanese were bosses included in the English version: Sephiroth, Ice Titan, and Kurt Zisa.
Enemies
Most Heartless are recolored and several new ones are added:
* Chimaera
* Gigas Shadow
* Grand Ghost
* Stealth Soldier
* Pot Scorpion
* Pink Agaricus
* Jet Balloon
* Missile Diver
* Sniper Wild
* Black Ballade
* Neoshadow
Weapons
Two new weapons were added for each main character. These serve as 'secondary ultimates', with one having more power than the regular ultimate weapon (Ultima Weapon, Save the King, and Save the Queen) usually with an MP reduction, while the other has more Magic potential with low physical capabilities.
* Sora's Keyblades: One Winged Angel and Diamond Dust.
* Donald's Staves: Meteor Strike and Fantasista.
* Goofy's Shields: Massive Bumper and Seven Elements.
Abilities
Ten new abilities were added:
* Slapshot
* Sliding Dash
* Stun Impact
* Gravity Break
* Ripple Drive
* Hurricane Period
* Zantetsuken
* Leaf Bracer
* Tech Up
* Encounter Up
Accessories
Along with some minor changes to three existing accessories, the following new accessories were added:
* Firagun Wrist
* Blizzagun Wrist
* Thundagun Wrist
* Black Ring
* Moogle Badge
* Cosmic Arts
* Royal Crown
* Premium Cap
* Ifrit Belt
* Shiva Belt
* Ramuh Belt
* EXP Bracelet
* EXP Earring
* EXP Chain
* EXP Ring
Cutscenes
Several new cutscenes were added. The first, shown after Sora ends up in Traverse Town, has Riku lost in Hollow Bastion, calling out for his friends and Maleficent looking on. Another, played after Sora speaks to Kairi in the underground waterway in Traverse Town, showed Riku lost in the Realm of Darkness after Ansem, Seeker of Darkness took his body. There, he is assisted by King Mickey who reveals that he has the realm's Keyblade. An optional cutscene was a confrontation between Cloud and Sephiroth, seen after the player defeats Sephiroth. Cutscenes were provided for Unknown, using spliced voice acting for Sora and Goofy, but shaking text on a black screen for Unknown.
A minor cutscene was also added near the start of the game on the second day on Destiny Islands, where it is revealed that the lucky charm Kairi makes out of thalassa shells is the Oathkeeper charm she later gives to Sora.
These new cutscenes connect to the story in the Kingdom Hearts Novels more accurately.
* Another Side, Another Story [deep dive]
* Gummi Ship Missions
* Three more Ansem Reports