I watching Kingdom Hearts & Winx Club and I think they are Similarities
Series
Winx S1-S3 & KH1
Winx Season 8 & KH2
Winx S5-S6 & Birth By Sleep
Winx S4 & 358/2 Days
Winx S7 & DDD
World of Winx & KH3
Characters
Sky as Sora
Bloom as Kairi
Nex as Riku
Stella & Ginger (Stella's Fairy Pet) as Namine
Brandon & Kiko(Rabbit) as Roxas
Tecna as Xion
Helia as Lea/Axel
Timmy & Flitter(Fairy Animal) as Ventus
Daphne as Aqua
Thoren as Terra
Series
Winx S1-S3 & KH1
Winx Season 8 & KH2
Winx S5-S6 & Birth By Sleep
Winx S4 & 358/2 Days
Winx S7 & DDD
World of Winx & KH3
Characters
Sky as Sora
Bloom as Kairi
Nex as Riku
Stella & Ginger (Stella's Fairy Pet) as Namine
Brandon & Kiko(Rabbit) as Roxas
Tecna as Xion
Helia as Lea/Axel
Timmy & Flitter(Fairy Animal) as Ventus
Daphne as Aqua
Thoren as Terra