Fics like The Smile That Birthed Worlds

When Kairi’s physical form is vanquished by Xehanort and she is separated from her friends, her heart ventures to out to a world where two other lost hearts are searching for a way home. Features Kairi of Kingdom Hearts, Kida of Atlantis: The Lost Empire, and Eilonwy of The Black Cauldron.

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5. Kingdom Hearts: Keys to the Kingdom by thepenishellamightier (Kingdom Hearts, Alice in Wonderland (1951), more)
6. Cor Autem Aurora by HakureiRyuu (Final Fantasy XV, Kingdom Hearts)
7. A Reason to Fight by orphan_account (Kingdom Hearts)
8. Heroes of Light by Beribits (僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia, Kingdom Hearts)
9. Cheating Destiny by dreamer1024 (Kingdom Hearts, Compilation of Final Fantasy VII)
10. Man Falling From Space by CalicoColors (Kingdom Hearts)
11. Tell Me That I'm Real by Beastrage (Kingdom Hearts)
12. When all is Said and Done by godtiermeme (Atlantis: The Lost Empire (2001))
13. Ten Minutes Too Late by alangdorf (Kingdom Hearts)
14. carry me home by nerdofnerds, sersystem (Kingdom Hearts)
15. The Ones Who Will Open the Door by Oblitatron (Kingdom Hearts)
16. a hero's ending by jitters (Kingdom Hearts)
17. Terraforming by WavesBlade (Kingdom Hearts)
18. Just Go With It by burymeonpluto (Kingdom Hearts)
19. Prince of Disney Castle by leftenant (Kingdom Hearts)
20. Kingdom Hearts: The Antipode by Dorked (Kingdom Hearts)