(i) handed (my) flowers to (her) in front of (everyone). which underlined pronoun functions as an adjective in the sentence?

The answer is my. It is "describing" the flowers and saying that the flowers are mine. 
I, her, and everyone are pronouns that function as a noun phrase. They do/receive the action, while my is "describing" the flowers.

Give examples, people who actually harmed.

Dogs have been considered man’s best friend for decades! most likely because of their kind and loyal nature. they make splendid companions. their loyalty is beyond compare and after all, a dog is the only thing on earth that loves you more than he loves himself! dogs see us as their friends and leaders, they’ll do anything in their power to ensure your comfort and safety.