Her Personality:

Amy is a proactive go-getter that goes after what she wants and lets nothing get in her way. As early as the first Little Planet incident, Amy was shown to possess a proactive streak. When she had just her tarot cards to go by back then, she made her way all the way to Little Planet when her tarot cards told her that she had a "destined encounter" on the small satellite. She is likewise an intuitive activist, which usually means she acts before thinking things through.[14]

Amy is described as an "energetic tomboy",[3] though by the time of the Chaos incident, she is shown to nonetheless have traditional feminine interests such as shopping and fashion.[15] Despite her assertiveness though, it has not come at the expense of her sense of femininity. Amy also hates boredom and loves thrills and excitement; during her time in Station Square, she found her mundane city life dull and longed for the exhilaration of being a part of Sonic's adventures.

Amy is very open and expressive about her feelings and emotions, always speaking her mind and never letting her feelings get bottled up inside.[16] As such, Amy can be quite obsessive and aggressive, especially when it comes to her infatuations with Sonic. When angered, she has a habit of pulling out and threatening others with her Piko Piko Hammer, especially when people cross her or hurt people she cares about. Amy has as well been shown to have no reservations about expressing more extreme emotions, be it either crying when overcome with sadness or not holding back in expressing her over-the-top enthusiasm. As a result, Amy can come off as overbearing and very pushy, Possessing a powerful personality, her assertiveness and temper make her something of a troublemaker. All the same, she has shown to not tolerate people hurting those she cares about, and will retaliate with anger when witnessing such acts. As such, her enthusiasm tends to get her as much in trouble as it helps out others.

Originally, Amy was barely able to take care of herself when in dangerous situations. As such, she was ultimately a damsel-in-distress figure who needed Sonic to save her. Recognizing this, she eventually started chasing after her hero, and gradually "grew" into a tenacious and more proactive girl who was as active and strong as Sonic.[17]

In Sonic Battle, she develops a fascination with "Boxercise" playing to both elements of her personality. The exercise helps her lose weight to maintain her girlish figure, and the boxing to help her train when she's forced to fight. She also had shown a very powerful and aggressive attitude, willing to fight whenever necessary to help and protect those she cares about.

Amy has a kind heart and never gives up, having a strong belief in fate and destiny. Her faith in her tarot cards led her to the fated encounter that brought Sonic into her life, and in Sonic Battle, she shows such faith in her tarot cards that she insisted that Sonic would be at Tails' place on their reading outcome alone.

Amy is also an optimist,[3] and is usually very cheerful and possesses a positive outlook on life. Amy is always full of hope and is always cheering on for the good side of things. Notably, she almost never seems to find anything hopeless, as shown in Sonic Adventure, where she was determined to help birdie who had lost its family. This cheerfulness likewise makes her the driving force of her team.[14]

Amy has a very strong sense of empathy and a surprising capability for caring. She is very encouraging and is more than willing to reach out to all kinds of people. In Sonic Adventure, Amy showed she was more than willing to protect the bird that crashed into her from ZERO, and helped it reunite with its siblings out of the goodness of her heart. She similarly defended E-102 Gamma from Sonic when the latter tried to destroy him after motivating Gamma to rebel against Eggman. Similarly, in Sonic Adventure 2, she reaches out to Shadow, pleading to him by telling him that as selfish as humanity was, they deserved a chance to be happy. Likewise, during Sonic Heroes, Amy would raise Cream and Big's spirits whenever they lost hope about finding their friends. Also, in Shadow The Hedgehog, Amy insists that Shadow does not attack the Egg Pawns in Cryptic Castle and will show frustration when he does. When it comes down to it, Amy is a likable person and has rarely met anyone who she did not befriend (including Gamma, Shadow and Blaze).

Amy's personality has added more a humorous factor in games like Sonic Colors, Sonic Free Riders, and Sonic Generations with her obsession for Sonic, which causes her to say silly and embarrassing things.

Starting from Sonic Lost World, although Amy maintains her crush on Sonic, she is a lot more passive and her demeanor is more reserved and level-headed.

Ref: https://www.youtube.com/watch?v=9_2VjRc5zhc