- Identical Twin ID Tag: Her ribbons are worn on the left ear and usually red.
- No Mouth: Hello Kitty is very well-known for not having a mouth. However, she was given a mouth in various anime series starring her and other Sanrio characters including, Hello Kitty's Furry Tale Theater and the stop-motion series Hello Kitty Stump Village.
- Plucky Girl
- Red Oni, Blue Oni: The red to her twin Mimmy's blue.
- Identical Twin ID Tag: Her ribbons are worn on the right ear and are usually yellow.
- No Mouth: Just like her sister, she was also designed with no mouth.
- Red Oni, Blue Oni: To Hello Kitty's red. She's described as more shy and less outgoing than her twin.
- Art Evolution: My Melody went through a few design changes◊ over the years. Her original design had her ears pointed upwards◊ and was sometimes depicted with no mouth, but was given a rounder head and thinner body in the early 1980's◊. She was then given a cuter◊ and friendlier design◊ along with her friend Flat the mouse and Risu the squirrel◊ between 1985 and the early 1990's. She then went back to her normal look◊ later in the 1990's.
- Breakout Character: She became just as popular as Hello Kitty, which allowed her to receive her own anime where Kuromi co-stars. She also won the Sanrio Splatfest tournament in Splatoon 2.
- Bunnies for Cuteness: The first Sanrio rabbit character and one of the company's most well-known and beloved characters.
- Early Installment Weirdness: She started out as Sanrio's version of Little Red Riding Hood.note It wasn't until 1976 that Sanrio actually used "My Melody" as her name and became it's own series. Her friends (Piano, Flat, and Risu) and other family members (her brother Rhythm) were also introduced that same year.
- Furry Reminder: In Hello Kitty's Furry Tale Theater, she is commonly seen hopping from place to place. This has never been seen again since then.
- Girls Love Stuffed Animals: In her drooped ear design◊, she is commonly seen with a pink bunny doll.
- Iconic Outfit: Her red or pink hood, sometimes depicted with a white flower (sometimes with a bow). Her hood recently got a redesign◊ for her 40th Anniversary, where her ears are drooping.
- No Mouth: She has no mouth in The Adventures Of Hello Kitty & Friends and in some of her older designs during the 70's, but this is not as common in modern merchandise.
- Never Bareheaded: In most works, she is never seen without her hood. In Hello Kitty's Furry Tale Theater she can occasionally be seen not wearing it.
- Pink Means Feminine: Besides her red hood, My Melody is more commonly seen wearing her pink colored hood. My Melody's pink hood was introduced in 1976.
- Prone to Tears: In Hello Kitty's Furry Tale Theater, My Melody is very sensitive and can sometimes be found crying. One episode has her literally crying over spilt milk as she is cleaning the floor in the beginning of one episode where it's set in the Mother Goose universe. Hello Kitty (as Mother Goose) sees My Melody (as Little Bo Peep) crying when her sheep is lost.
- Sweet Sheep: One of My Melody's closest friends is a female sheep with pink wool named "Piano" aka "My Sweet Piano".
- Tender Tears: In one episode of the anime, My Melody is seen crying when she's very worried about her human friends.
- The Ditz: In the 2005 anime, she isn't dumb but is a real airhead.
- The Heart: She plays this role in the 2005 anime with her rival Kuromi. While Kuromi really dislikes My Melody for various accidents in the past, My Melody still sees good in her heart.
- The Pollyanna: My Melody is always optimistic and she can be rarely angry. This is especially notable in the 2005 Onegai My Melody.
- Amazing Technicolor Wildlife: He's a blue penguin.
- Animal Talk: Grew up speaking Penguinese, but he speaks English with almost the same fluency.
- Everything's Better with Penguins
- Sailor Fuku: A boy variant, since he wears a sailor hat.
- Sharp-Dressed Man: He has a collection of 365 bow-ties!
Little Twin Stars
- Artistic License Astronomy: The twins are apparently literal stars, but they appear as small children, and came to Earth from Omoiyari Star in the Yume Star-Cloud to become the 'best, shiniest stars they can be,' according to the Sanrio website. Safe to say, real stars aren't this adorable. The other stars we see in the OVAs are even smaller than them, and they wear stars on their heads. Adults, aside from the queen, lose their stars as they mature.
- Big Brother Instinct: Despite Kiki being the younger twin, he's not afraid to do anything for Lala. Best shown in the OV As
- Half-Identical Twins: If it weren't for their hair, it would be impossible to tell them apart.
- Gender-Blender Name: Kiki is a name usually associated with girls, and this Kiki is a boy
- Significant Birth Date: Their birthday is Christmas Eve
- Pink Girl, Blue Boy: Lala has long pink hair, Kiki has short blue hair. Sometimes the duo are depicted with different hair color such as Kiki having brown hair, while Kiki has blonde hair.
- Red Oni, Blue Oni: A mild case. Lala is more shy and girly while Kiki is a bit more curious and cheeky.
- Viewer Gender Confusion: You're forgiven if you thought Kiki was a girl
- Bunny-Ears Lawyer: Despite his scatter-brains, he is good at picking up on the latest news.
- Cloudcuckoolander: is pretty scatterbrained.
- No Mouth
- Bratty Half-Pint: He's stuck in first grade and rolls his eyes at anything he finds silly, which is many things in his home town.
- Cool Pet: Has a pet alligator named Pochi.
- Everything's Better with Penguins
- Parenting the Husband: His mother is said to have this kind of relationship with his father, who spends much of his free time playing pinball (not that they mind).
- Tsundere: A male example.
Kero Kero Keroppi
- The Ace: He's great at what he does and his charming personality makes him loved by his neighbors.
- The All-American Boy: Despite his origins in Japan, Keroppi is pretty close to this archetype: He loves baseball, has a mischievous streak in him, and is an all-around sweet kid.
- Frog Men
- The Pollyanna: Nothing ever seems to get him down.
- Single-Target Sexuality: Downplayed since he is a child, but the only girl he loves is his girlfriend Keroleen.
- Two Guys and a Girl: He is a triplet, with his brother (Koroppi) and sister (Pikki).
- Dark Magical Girl
- Friendly Enemy: Outside of Onegai My Melody, she doesn't seem to hate Melody at all.
- The Leader: Kuromi is the leader of Kuromi's 5, a 5-unit biker gang who love riding their tricycles while causing mischeif at high speed. The 4 members of Kuromi's 5 are Nyanmi, Wanmi, Konmi, and Chumi.
- The Rival: To My Melody, but the other rabbit doesn't view her as such.
- Tsundere: Can be brash, but deep down she does care.
- Tom Boy And Girly Girl: Tomboy to My Melody's Girly Girl.
- Tomboy with a Girly Streak: She is tough, but also has a secret love of romance novels.
- Anthropomorphic Shift: In early merchandise up till mid 2007, Cinnamoroll used to be seen standing on all fours◊. This was phased out and Sanrio stuck with him walking on two legs.
- Badass Adorable: Cinnamoroll is seen rescuing his cafe owner Anna in Cinnamon The Movie before she falls during the climax.
- Blush Sticker: He has permanent pink blushing cheeks.
- Breakout Character: Cinnamoroll started gaining popularity in Japan beginning in 2005 with the Fluffy Fluffy Cinnamoroll manga series. This led to Sanrio eventually creating the movie in 2007 Cinnamon The Movie. Between 2007 and 2008, Cinnamoroll was the second most popular Sanrio character next to Hello Kitty.
- Cat Smile: His default expression, which is shared with his friends.
- Characterization Marches On: In the early years of his existence, Cinnamoroll note used to not be able to speak full sentences and could only bark and whimper. This is seen in very old flash shorts made between 2002 and 2003.
- Ear Wings: Cinnamoroll is able to fly due to being born from a cloud.
- Lovable Jock: Loves to play basketball, soccer, and skateboarding.
- The Klutz: Despite being athletic, he often trips.
- No Mouth: Similar to Hello Kitty, he is given a mouth in some animated projects such as the 1994 direct-to-video series Pochacco and Hello Kitty's Animation Theater.
- Anthropomorphic Food: Design-wise. He is a dog but with his yellow fur and brown beret, he looks like flan (or Purin, as it's called in Japan)
- Big Eater
- Big Friendly Dog: He can make friends with almost anyone, and is a chill laidback back dog.
- Happily Adopted: He loves his owners as much as he loves his parents.
- Momma's Boy: He loves his mother dearly.
- Trademark Favorite Food: His mom's cream caramel puddings.
- Childhood Friend: To Hello Kitty.
- The Dandy: He pays great attention to his appearance.
- No Mouth
- Spear Counterpart: He looks exactly like Hello Kitty except he has spiky hair on top of his head and lacks the iconic bow.
- Victorious Childhood Friend: In some works, he's described as Hello Kitty's boyfriend.
For a comprehensive list of tropes applying to Retsuko, see the Aggretsuko character page.
- Brilliant, but Lazy: Emphasis on the LAZY. On occasion, Gudetama has shown up the humans around it in activities ranging from a rhythm-based mobile game, to swatting a feisty mosquito. It also sometimes offers sagely advice (often of the depressing sort) that includes Lampshade Hanging with a dash of Only Sane Man (Egg?), usually when the humans around it are being shallow/foolish.
- Moe Anthropomorphism: It's an egg.
- Lazy Bum: Gudetama is always tired.
- No Biological Sex: Because it's apparently an unhatched egg that could turn into just about anything. Spelled out in one episode when a farm worker sorting chickens according to sex comes across a whole separate partition just for Gudetamas!
- Sloth: It's defined by its laziness.
- The Eeyore: A more accurate translation of the "Gude" in its name apparently references the total lack of motivation brought about by depression. Yeah...
- Terse Talker: Gudetama speaks slowly and in short sentences, owing to its lazy nature.
- Trademark Favorite Food: A given, considering the character is, well, an egg, but Gudetama itself craves soy sauce, as it is a common condiment with Japanese raw egg rice.
- Darker and Edgier: Downplayed with their demonic forms, they just appear a little more spooky. Berry's horns turn upward, his wings become skeletal, he grows claws, and his eyes turn yellow. Cherry's ears turn more batlike, her tail gets thicker, and her eyes turn red.
- Ear Wings: Cherry's ears are bat wings.
- Evil Minions: They work with Kuromi at one point in Onegai My Melody.
- Friendly Enemy: In recent years, Berry and Cherry have become friends with Cinnamoroll and his friends. Most notable in Cinnamoroll's official Twitter account.◊ In early merch, Cinnamoroll and his friends don't get along with the duo.
- Gothic Lolita: Cherry.
- Oblivious to Love: Cherry has a crush on Cinnamoroll's friend Espresso. Espresso is unaware of Cherry's feelings for him.
- Nice Hat: Cherry wears a mini top hat.
- The Prankster: Their favorite hobby is pranking the villagers that live by their castle.
- Red Eyes, Take Warning: Cherry in demonic form.
- Supernatural Gold Eyes: Berry in demonic form.
Mell (Wish Me Mell)
- Art Evolution: While Mell's appearance hasn't changed very much. Mell had a V shaped mouth in older material before changed to a regular smile with her mouth looking more curved.
- Audience Participation: While Mell was announced by Sanrio in December 2010. She didn't make her first physical appearance until January 25, 2011. Sanrio actually encourage real life participation from social media to encourage her to come out of her house.
- Gratuitous French: Due to being from France, she loves mixing in some French language into her sentences.
- Green-Eyed Monster: While Mell is good friends with My Melody, she does get envious of her popularity when she's not around. One video from Puroland's Youtube channel shows her working at a store that features a pile of various Sanrio characters. Mell looks at a pile of My Melody stuffed animals and holds one of them in her arms. While doing this, she starts to feel a bit sad.
- Hikikomori: She was originally this between December 27, 2010 and January 24, 2011.