Her Personality:

Pinkie is hyperactive, excitable, quirky, and outgoing, often speaking and acting in non sequiturs. She warmly welcomes new faces such as Twilight Sparkle and Cranky Doodle Donkey. True to the element of laughter she represents, she loves to make ponies smile and laugh.

Pinkie tends to have a lighthearted manner in serious situations, such as stopping to drink chocolate milk raining from a cotton candy cloud when the main characters confront Discord in The Return of Harmony Part 2. As a result, she is often not taken seriously even by her closest friends, who occasionally call her out on her seemingly illogical behavior.

In The Return of Harmony Part 1, Discord hypnotizes Pinkie with his chaotic magic. In this state, Pinkie is an irritable grump who hates laughter and happiness and has a general dislike of many things. When she's returned to normal in the following episode, she laughs and says, "I-I turned gray! Can you believe it?!"

Cartoonish behavioredit | edit source
See also: Gallery of Pinkie being cartoonish

Pinkie comically twists her neck.

Pinkie frequently performs cartoonish feats, such as eye-bulging, wild takes, and unusually angled cuts into the frame. Her merry skips resemble Pepé Le Pew's, particularly in Griffon the Brush Off. Her costume and waddle in Dragonshy are reminiscent of Daffy Duck's four-legged body in Duck Amuck.

On several occasions, Pinkie breaks the fourth wall and shows awareness of cinematic elements. For example, at the end of Over a Barrel, she pokes her head through the iris wipe to grumble about Twilight's friendship lesson, and in Magic Duel, she stretches the iris wipe wide open and climbs into the black screen to protest about her vanished mouth, and in Make New Friends but Keep Discord, she gets so excited about Discord buying all the cakes in the bakery, she shakes the camera. In The One Where Pinkie Pie Knows, after Pinkie claims that keeping Cadance and Shining Armor's secret was a "piece of cake", when the screen irises in on her, she shakes her head at the viewers, indicating the contrary.

Love of partiesedit | edit source

"Let's party!"

Pinkie Pie is first introduced as a talented and avid party-thrower. She throws a party for Twilight Sparkle in Friendship is Magic, part 1, a welcome party for Gilda in Griffon the Brush Off, and a birthday party for Gummy in Party of One (and even an "after-birthday party" the following day). Pinkie is even shown to throw parties on completely random occasions, such as a "finish ringing the school bell" party in Castle Mane-ia.

In The Cutie Mark Chronicles, Pinkie says she got her cutie mark when she was inspired to throw her first party for her dour family. In Party Pooped, Pinkie is revealed to have a secret party planning cave in the Sugarcube Corner basement.

Party cannonedit | edit sourceMain article: Party cannon

Pinkie Pie with her party cannon.

In Sweet and Elite, Pinkie organizes a birthday party for Twilight on very short notice, putting up decorations in very little time with her "party cannon." The cannon would become a running gag throughout the show, up to the point where Pinkie even uses it to fight off the changelings in A Canterlot Wedding - Part 2. The cannon is used again and alluded to in multiple episodes and other media, and a giant cannon appears in My Little Pony The Movie.

Insecurityedit | edit source

Pinkie Pie not quite feeling like herself.

On occasion, Pinkie Pie shows an insecure side of her personality, doubting her friends or herself. In Party of One, she believes her friends to be unfaithful, causing her hair to "deflate" and her coat color to fade to a grayish pink. She slowly goes insane as she adopts several inanimate objects as new friends, pretending that they are real.

Pinkie Pie tries to prove that she is responsible in Baby Cakes by begging Mr. and Mrs. Cake to let her babysit Pound Cake and Pumpkin Cake. When the Cakes eventually agree, Pinkie Pie quickly becomes overwhelmed by the task and shows doubt in her ability to handle the responsibility.

In A Friend in Deed, Pinkie Pie tries to befriend Cranky Doodle Donkey, despite his many rejections. She only succeeds in making a friend out of him by reuniting him with Matilda.

In Too Many Pinkie Pies, Pinkie Pie creates duplicates of herself in order to make time for her friends. However, when Ponyville becomes overrun by dozens of Pinkie Pies, Pinkie Pie soon wonders if she's even the real Pinkie Pie.

In Pinkie Pride, Pinkie Pie feels outdone and replaced by Cheese Sandwich and doubts in her own partying abilities. She gives up party planning and tries other tasks but fails at them. Her faith in herself is only renewed when she looks back on parties she had thrown for her friends, including Twilight's welcome party and the wedding reception for Shining Armor and Princess Cadance.

Ref: https://www.dailymotion.com/video/x7eopfo