[FairyKing]

This is a weird theme for a sentai, but hear me out: Love.
Aisuru Sentai HeartRanger

Protecting all I can! I love my friends! Red Heart! / Protecting all the world! I love everyone! Red Heart of Gold!
Honoring our family! I love my father! Blue Heart!
Brightening the future! I love my daughter! Pink Heart!
Carrying your dream! I love my brother! Green Heart!
Becoming a hero! I love my idol! Yellow Heart!
Fighting hand in hand! We love each other! Black Heart and White Heart!
Breaking people's bonds! I love no one! Steel Heart! / Breaking evil's hold! I love myself! Silver Heart!