Impa is one of the more interesting recurring Zelda characters because she’s changed the most drastically between entries

Skyward Sword is a very interesting take on the character,, showing both her youthful version and having her become an old lady in present day

Her evolution is going from Zelda’s old Nursemaid who told Link what to do in the first game’s manual to becoming the head elder of an ancient tribe of ninjas who once had proficiency in technology.

Her development is in part due to the establishment of the Sheikah