Since the creation of the series, Final Fantasy was a key part Kingdom Hearts' identity, with various characters appearing throughout the franchise. For now Kingdom Hearts 3 moved away from Final Fantasy performance compared to past records, Kingdom Hearts 4 has a chance to double up on cameos thanks to the revival Final Fantasy in recent years. One of the best ways to upgrade Final Fantasy representation in Kingdom Hearts 4 this will introduce a new secret boss similar to Sephiroth in the previous titles.
Although the popularity of Final Fantasy 7 the remake of the trilogy made Sephiroth and the rest of the game more relevant than ever, there is a huge list of characters from Final Fantasyhistory still unused in Kingdom Hearts franchise. Although it is easy to see how the updated version of Sephiroth from Final Fantasy 7 Rebirth can make an interesting twist on the villain's past appearance in the Kingdom Heartsincluding him as a secret boss again can feel like retracing old positions. Therefore, Kingdom Hearts 4 worth looking at some of the Final Fantasyother iconic opponents to create a new secret boss that can fight Sephiroth.

Relatives
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Kingdom Hearts 4 has its lion's share of potential Final Fantasy secret bosses to choose from
Classic Final Fantasy villains who could be Kingdom Hearts 4 secret bosses
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Garland (Final Fantasy 1)
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Kefka (Final Fantasy 6)
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Ultimecia (Final Fantasy 8)
with Final FantasyThe original villain, Garland, became more fleshed out thanks to Stranger from Paradise: Final Fantasy Originthere is room for the character and his alter ego Chaos to threaten Sora Kingdom Hearts 4. Kefka from Final Fantasy 6 is another great option, with his iconic status in the franchise almost on par with Sephiroth, and the potential for a multi-phase fight as the final encounter in his home game to rival the intense Kingdom Hearts Boss fights like Ansem from the original and Xemnas from Kingdom Hearts 2 be incredibly tall. Final Fantasy 8Ultimiecia would be a good counter to Sephiroth as a prominent female antagonist and would pair with another FF8 characters like Squall/Leon, Selfie, and Seifer who have already appeared in the series.
Modern day Final Fantasy villains who could be Kingdom Hearts 4 secret bosses
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Ardyn Izunia (Final Fantasy 15)
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Barnabas Tarmr (Final Fantasy 16)
Even more relevant than the classics Final Fantasy the villains would be antagonists from recent games such as Final Fantasy 15Ordinsky or Final Fantasy 16Barnabas. Ardyn would work especially well as a secret boss Kingdom Hearts 4 if Noctis appears as an ally after the attacks he uses in his FF15 mirror to fight Noctis's boss. Barnabas can make for an even more menacing secret boss as he is Aikon Odin's dominant, which would be a great way to pit Sora against the classic Final Fantasy to cause
The Final Fantasy 7 Remake Trilogy should not turn Sephiroth into a Kingdom Hearts 4 Shoo-in game
Despite Sephiroth's fame in the sequel Final Fantasy 7 remake trilogy, huge potential, etc Final Fantasy villains are kept as secret bosses Kingdom Hearts 4 should be researched above Art FF7 the villain Sephiroth has already acted as a secret boss in Kingdom Hearts 1 and Kingdom Hearts 2as a fighter in Olympus Coliseum and as an optional boss fight in Radiant Garden respectively. While memorable, these fights certainly showcased Sephiroth's potential as a boss in a big way. Kingdom Hearts universe.
with Kingdom Hearts 4 kicking off a new story arc in the franchise, this would be the perfect opportunity for the series to completely reboot it Final Fantasy elements. Since Final Fantasy 7 remake trilogy already gives players plenty of opportunities to fight Sephiroth by including him again as a secret boss in Kingdom Hearts 4 can feel repetitive. Instead, the game could create an entirely new experience for players by pitting Sora against one of the Final Fantasy many other villains for secret boss fight.