They are quite bright students (they even have their own twin language) and are often very conniving and mean, even to each other. When it comes to Bart they are quite stuck up, and never miss an opportunity to berate him. Bart appears to have a crush on one of them, but Homer states that Terri is the one that Bart has a crush on. One of the twins stated that her sister had a crush on Bart. It is unknown if this is the truth or if it is just teasing. She also has a "boy crazy" cousin who has a crush on Bart. (Bart feels affection for her and she may also feel affection for him).
Principal Skinner apparently considers Terri less smart or talented than Sherri, because in Simpson Tide he announces, "In the event of nuclear war, we can only save our best, and brightest. Therefore, space in the fallout shelter will be reserved for: Lisa Simpson, Martin Prince, our championship kickball team, and Sherri, but not Terri."
Sherri and Terri appear in stage 1 and 2 carrying a burger in a plate for the Simpsons to gain their health.
Sherri and Terri were one of the holders of the three Sparklemon that Homer and Lisa must defeat.
They have similarities to the Grady Twins (ghost girls) Danny sees in Stanley Kubrick's adaptation The Shining, of Stephen King's The Shining novel of the same name. In a deleted scene of the parody of the Shining called "Treehouse of Horror V" they are ghost twins seen by Bart. They also take on this role in The Simpsons Game were in a game engine elevator they are heard saying "Come Play With Us Simpsons". She is said to be the taller of the two.
Terri with her classmate with her boyfriend Bart for summer
Lisa and Nelson stinky Terri and sister
Terri and her sister kiss Bart
Terri and Sherri as adults
Terri wearing gymnastics clothes and laughing with Lisa.
Terri and her classmates are angry at Edna.
Terri and her classmates glare angrily at Milhouse.
Changed her appearance into that of an Indian.
Eating with her twin and the other kids.
Terri as a Kindergartner.
Terri wearing a new dress for the dance. Her new look is exactly the same as her twin's look.
Terri and Sherri horrified at the song from Lisa,Nelson and other friends sang for them.
Terri and Sherri running from the skunk.
Terri being dimpled by Vicki.
Terri laughing at Principal Skinner's lecture of Superintendent Chalmers crying like a girl.
Bart talks to Sherri and Terri on the bus
Terri blames Bart for ruining their game
Terri tells Bart that her sister likes him
Sherri and Terri talk on the bus
Sherri and Terri panic as their bus crashes into the sea
Sherri and Terri cling to each other as the kids are swept into the sea
Terri crying at being stranded.
The kids argue over who is to blame for the crash.
The children gather around as Bart explains what they are going to do after getting stranded
The kids panic after Milhouse claims to have seen a 'monster'
Bart rescues the food from the sunken bus
The other children glare at Milhouse when they think he has eaten all the food in the night
Sherri and Terri with Martin, Lewis and Wendall
Sherri and Terri shocked with the other kids after Bart declares Milhouse 'not guilty' during a mock trial
Sherri and Terri tease Bart by deliberately giving him false information for his book report assignment
Bart Jr. Bart and Terri's imaginary future son
Sherri and her sister Terri present public at Principal Skinner
Sherri glare angry at Bart ruined by Willie
Sherri blames Bart for ruining their game
Sherri tells Bart that her sister likes him
Terri glare angry at Bart ruined by skate
Terri, Sherri and Janey glare at Bart skate
Terri and other friends classmater happines aniversary at Principal Skinner
Sherri and her family for birthday to Terri at Moe
Terri running to fire alarm
Terri and Sherri with Becky song Skipping
Terri and her sister team class gymnastics
Terri tell to Lisa likes you swimmingpool.
Bart look likes Terri and Sherri
Bart likes Terri speak by bus
Terri with her sister and her mom see likes Bart her boyfriend
Terri with Sherri and Bart
Terri like Bart relationship eat gum
Terri with her sister like Bart relationship eat gum
Terri with Sherri see Homer danger
Terri with Sherri danger Homer accidentally
Terri with Sherri happy to Bart her boyfriend
Terri with her boyfriend Bart and her friend Lisa
Terri see Skinner and Krabappel kiss closet and thank Bart
Terri with Sherri, Allison and Alex please for Lisa
Terri with Sherri sad because likes Bart
Terri with Sherri, Bart, Lisa and other kids fire book
Terri with Sherri that say Bart relationship together
Terri with Sherri likes Bart
Terri with her boyfriend Bart together relationship
Terri is the wife from Bart and the mother from Bart Jr., Jenny and Penny
Terri, Sherri and Janey glare jealous by her boyfriend Bart
Terri and Sherri with Bart song loves
Terri has crush on Bart (loves you)
Terri with Sherri eat with her friend (Lisa)
Terri with Sherri say has crush on Bart and him likes her
Terri and Sherri hug her parents
Terri and Sherri say Bart came back
Terri with Sherri glare Martin
Terri + Bart (loves-interest)
Terri with her friends and her friend (Lisa)
Bart the presents for Terri and Sherri as girlfriends
Terri with her sister and her mom
Bart vs Homer mentioned by Terri
Bart say table: "hey, girls"
Terri with Sherri and Lisa with other friends play together Homer
Jenny and Penny is the daughter from Terri and Bart
Homer with his friends Bender is the friends from Bart, see look Leela and Fry as Terri and Bart
Terri with her sister and her parents likes that Lisa with her father-in-law from Bart´s father
Terri and Sherri run to Bart kissed
Terri with her card for her boyfriend Bart
Terri with Sherri likes Lisa that one her boyfriend´s sister.
Terri with Sherri likes Bart is best couple official
Terri with her sister and her mother speak her mother-in-law from Bart´s Mother
Terri with Martin and Unnamed
Terri has crush on Bart (likes you)
Terri and Sherri angry by Bart ruined relationship
Terri + Bart, Nelson + Lisa
Terri see her boyfriend Bart say "I, Love, Terri"
Terri likes Bart is a famous
Terri wear bathroom´s suit pink
Terri and her sister angry at Bart ruined relationship never have a sister
Terri + Bart just girlfriend together relationship "to be my boyfriend"
Terri likes Bart some boyfriends together
Bender say Homer: "you son dating his girlfriend, except Bart and Terri or Sherri"
Terri see her boyfriend Bart glare at Milhouse
Terri have a son Bart Jr.
Terri with her sister need to Lisa camp.
Terri likes with her boyfriend Bart and except Sherri.
Terri with Sherri dance speak with her twin
Terri with her sister in her house and her need for her boyfriend Bart
Terri with her sister and her friend Lisa
Terri with her boyfriend Bart side together relationship
Terri likes Bart some boyfriend relationship skate mud
Terri likes her boyfriend Bart with her card loves
Terri likes Bart some boyfriend together relationship say "acapulcs"
Terri with her sister have a sons the brother from Bart Jr. her gets marriage by Bart from The Simpson´s Family and Terri got married with Bart and oppotunity but Nelson out her.
Nelson gets married with Lisa and Terri gets marriage by Bart and but Nelson out her abadoned.
Terri and her sister has crush on Bart (that romantic)
Terri gets kissed to Bart (faked death)
Terri and Sherri with her parents for meet to Bart
Terri and Sherri with Bart her song
Terri with Sherri touch to her bullie Francie
Terri with her friend Lisa likes you
Terri and Bart together relationship side scared nightmare Willie
Terri with her sister and her dad need for her boyfriend Bart.
Terri with her sister play with her friend Lisa and need to her father-in-law as her boyfriend´s sister´s father.
Terri with Sherri say Lisa say Homer "Not"
Terri with her family shocked
Terri with Sherri and see her boyfriend Bart
Terri see her boyfriend Bart (glare shocked)
Sherri say Terri meet a boys Mafia is Fat Tony´s son by jealous to Bart her boyfriend
Terri say Sherri that Bart is her´s boyfriend gets jealous by a boys mafia and after Bart dating with her.
Sherri and Terri hello to Michael and Bart gets jealous.
Terri with Bart together relationship other time from new side relationship.
Terri with Sherri adored to Bart
Terri with Sherri as Piccolo
Terri with Sherri and Bart with Milhouse
Terri fear glare by Mr. Lassen and her saved to Bart
Terri with Sherri happines to Homer is her boyfriend´s father
Terri work bus by except Jimbo and her work lose weight
Terri with her boyfriend´s grandpa for tria to her boyfriend Bart.
Terri with Sherri and Bart
Terri running kissed Bart.
Bart is the boyfriend from Terri or Sherri and left Slinky Dog is the boyfriend from Musa from Toy Story 4.
Terri speak with her friends her likes Bart.