Here is the smart and brilliant with the nice and bit goofy

Dr. Whooves and Derpy

Dr. Hooves, also known as Dr. Whooves or Time Turner, is a background male Earth pony with an hourglass cutie mark. The character was given the name Doctor Whooves by fans (as a reference to the sci-fi drama Doctor Who, created by the BBC), which was adopted by the show’s crew, and only later was the character explicitly given the name “Time Turner”, chosen by Enterplay consultant Wendy E., in Enterplay’s 2012 set of trading cards and with different punctuation on a 2012 IDW comic book cover; Gameloft’s 2012 mobile game initially also gave him the name “Time Turner”, but a 2013 update changed his in-game name to “Dr. Hooves”, a name that has also been given to him in Mighty Fine’s merchandise following the 2012 rejection of the original name “Doctor Whooves”. Hasbro acknowledged the character’s popularity in the Comic Con 2011 promotional poster, where he is explicitly posed in a way that his cutie mark is clearly visible. Dr. Hooves shares his design with Meadow Song and Lucky Clover.

Derpy, also known as Muffins and Ditzy Doo, is a female Pegasus pony who was given the name Derpy Hooves by the show’s internet following due to her cross-eyed “derpy” expression in the first episode. The name has since been adopted by the crew and Hasbro. Starting with Feeling Pinkie Keen, the show’s crew began giving the pony crossed eyes intentionally and later gave her “Where’s Waldo” type cameo appearances as a nod to the fans. The character is addressed by Rainbow Dash in The Last Roundup as Derpy, where she speaks for the first time. The scene was later altered so Rainbow no longer names Derpy, in addition to her voice being altered and eyes being less crossed. She is called Equestrian Mailmare or Bubbly Mare, among various others, in some merchandise. She shares her design with Sunshower Raindrops.