Some TotK spoilers, sorry.
"Gods and Men" is the theme, every character has "Men" mode and "God" mode. Some have intermediary stages.
Young Link (OoT) and The Hero's Shade
Zelda (SS) and Hylia
Ganondorf (TP), Ganon (Z1) and Dark Beast Ganon (BotW)
Din and Onox
Nayru and Veran
Cole and...