Nora: Yes, Ren?
Ren: I don't think sloths make a lot of noise.
A character's speech patterns, especially how much and how loud they speak, are often the most apparent indicator of their personality. This trope is by pairing two ends of this spectrum into a duo.
A common variation of Red Oni, Blue Oni, the Energetic and Soft-Spoken Duo is a duo consisting a character who is loud, talkative, and/or with tons of energy as the "Red" and a soft-spoken and reserved, but not necessarily shy, character as the "Blue".
Like in Red Oni, Blue Oni, the energetic partner is often the character who gives the impetus to act and the energy to move forward, while the soft-spoken partner is usually more introspective and savvy, and acts as the energetic partner's level-headed counterweight.
Compare to Savvy Guy, Energetic Girl for the gendered version of this, Ham and Deadpan Duo for when a loud character is paired up with The Stoic, and Uptight Loves Wild for a conservative, often boring character and an energetic character. May overlap with Foolish Sibling, Responsible Sibling in the case of siblings.
- Mira and Ao, the main duo of Asteroid in Love, follow this dynamic. Mira is a Genki Girl with No Indoor Voice who has endless enthusiasm for just about everything, while Ao is a more intellectual person who is uncomfortable speaking to others, except Mira.
- Durarara!!: Deliberately invoked by Mairu and Kururi Orihara. They literally flipped a coin to decide which one would be which. In this case, Mairu the Genki Girl and an absolute chatterbox, while Kururi is laconic and typically inexpressive. They behave the opposite on the chatroom, though.
- Excel Saga: Excel is a hyperactive Genki Girl with no concept of subtlety whatsoever. Her partner Hyatt is a quiet, polite Ill Girl with a bad habit of randomly dying then coming back to life.
- The main duo in Laid-Back Camp. Nadeshiko is a very excitable Genki Girl who often shouts, while Rin is a loner who is mostly dry and laconic.
- The main Official Couple consists of the loud, Idiot Hero Naruto and the Shrinking Violet Hinata. By adulthood (as shown in the sequel Boruto and to an extent The Last: Naruto the Movie) Naruto has matured into a less energetic man than he was originally while Hinata has traded her awkward shyness for simple, quiet level-headedness, however they still fit to a degree.
- Sasuke and Sakura are this combined with Brooding Boy, Gentle Girl. Sakura is energetic and spunky while Sasuke is stoic and quiet. Sakura has had a crush on Sasuke since before the series began. The two end up Happily Married.
- Tweeny Witches: Arusu and Lennon are a pair of "mirrors" in the latter's words, but they're actually half-siblings. The former is a boisterous Genki Girl, while the latter is a quiet, reserved person.
- Very common in the Pretty Cure franchise:
- Futari wa Pretty Cure: The main duo, Nagisa and Honoka, fit the bill. Nagisa is an energetic jock, while Honoka is a more thoughtful and introspective scientist.
- Futari wa Pretty Cure Splash★Star: Saki and Mai start out as expies of the above, but Saki is far more of a Genki Girl than Nagisa, without as many of the former's Deadpan Snarker and Determined Defeatist tendencies, and Mai is a sensitive artist.
- Heartcatch Pretty Cure broke the trend by making Tsubomi, the pink Cure, a Shrinking Violet, while her partner Erika was a hyperactive extrovert with No Indoor Voice.
- Happiness Charge Pretty Cure: A variation. The two leads, Megumi and Hime, are both rather energetic characters in the right circumstances, but Hime has No Social Skills at first, and is extremely reluctant to open up to anyone else.
- Mahou Tsukai Pretty Cure: Yet another duo, with Mirai being the cheerful, exciteable Genki Girl and Riko being a Tsundere.
- Star★Twinkle Pretty Cure: And once again with Hikari and Lala. Hikaru is the Adorkable and adventurous one, while alien girl Lala is calm and rational.
- Do You Believe In Fairies?:
- Deconstructed, along with Loving Bully. In canon, Shrinking Violet Candace is paired with the campy Julius, but the story adds a dose of Reality Ensues and explores their relationship more. They're not actually good for one another. Julius doesn't mean to be rude, but he's still a jerk who invades Candace's personal space and critiques her. Julius' traumatic behavior as children led to Candace becoming cripplingly shy and gaining a Speech Impediment.
- Played straight with Candace and Luke, the resident Hot-Blooded Genki Boy. Luke may be loud but he has a gentle nature which mixes well with Candace's shy and sweet personality.
- Shino and his girlfriend Fu fit into this dynamic perfectly in Son of the Sannin. He's just as quiet as his canon counterpart, while she is pretty much incapable of shutting up. After meeting his Motor Mouth Genjutsu World counterpart during her jinchuriki training, she complains how it throws off their whole dynamic.
- Cats Don't Dance has a villainous pair: The Prima Donna Darla Dimple does most of the talking, since maintaining her facade as "lover of children and animals" requires being the keet under scrutiny. Max is Darla's Mighty Glacier manservant, who rarely says more than, "Yes, Miss Dimple." Together, everyone at Mammoth Studios walks on eggshells around this Alpha Bitch and her bone-crunching enforcer.
- The two main females in My Teen Romantic Comedy SNAFU are Yukino Yukinoshita, an Aloof Dark-Haired Ice Queen with a Brutal Honesty, and Yui Yukinoshita, a Rose-Haired Genki Girl. Both meet in the Service Club and since then they become good friends and eventually rivals for Hachiman's heart.
- "Beast Princess" Seness and her second-in-command Eirotte from Scrapped Princess. Seness is a rude, violent, and headstrong fighter, while Eirotte is her soft-spoken but strong-willed Girl Friday.
- Downplayed for the titular characters in Laverne & Shirley. Laverne is very loud and Shirley is normally pretty demure, although she's still energetic and can be quite a drama queen.
- Gomez and Morticia Addams, in all their incarnations. Gomez is outgoing, expressive, and energetic, while Morticia is quiet, aloof, and reserved.
- The Scottish miniseries, Takin' Over the Asylum gives us the adorable, bouncy, hypomaniac, Campbell Bain and his very quiet, withdrawn schizophrenic best friend, Fergus McKinnon. Same is also true when Campbell is paired with the sad-sack alcoholic main protagonist, Eddie McKenna.
- Biff and Sully on Sesame Street. Biff is loud and abrasive, preventing Sully from speaking at every oppertunity.
- The change of voice actors in the Telltale Games installments in the Sam & Max series turned the titular duo into this, with Sam as the soft-spoken and Max as the energetic.
- Pearl and Marina from Splatoon 2 are an Odd Friendship example. Loud and short Inkling Pearl is best friends and music partners with a shy, lanky Octarian woman named Marina. This is most seen in their Japanese dialogue as the English translation made Marina a more assertive character, however it still shines through in the English versions too.
- Story of Seasons: In Harvest Moon: Tree of Tranquility and Harvest Moon: Animal Parade, Candace and Julius form a rival couple. Candace is a Shy Blue-Haired Girl who likes knitting while Julius is a loud, flamboyant Camp Straight fashionista. The two can end up married with kids.
- Undertale: Sans and Papyrus. Papyrus is very bombastic and consistently speaks in ALL CAPS, while Sans is chill and lazy and generally has no capitalization in his speech at all.
- Axis Powers Hetalia: America and Canada, twin brothers, qualify. America is boisterous, energetic and loud, while Canada is timid, shy and quiet to the point where most of the others can't see him or remember his name most of the time except for rare occasions where they mistake him for America. The only time we see Canada raise his voice is a three hour rant about his brother.
- Classic Disney Shorts: Demure and quiet Minnie Mouse happens to be best friends with the loud and bombastic Daisy Duck.
- Among the Looney Tunes, there are the cartoons featuring Foghorn Leghorn paired with Egghead. Foghorn is an Affectionate Parody of Senator Claghorn: loud, boisterous, pompous, physically cannot shut up. Egghead is a meganekko Child Prodigy that's The Speechless, who uses his smarts to completely outwit and outmatch Foghorn at every turn.
- The Loud House: Goth girl Lucy Loud is so quiet she startles people by speaking near them. Compare against screaming Bratty Half-Pint Lola, baby Lily when she cries, Lisa's mad science explosions, Luna's amplified rocking out, Luan's comedy, Lynn Jr's sporting superstitions. The other siblings are also... Loud... But mostly when arguing.
- My Little Pony: Friendship Is Magic:
- Fluttershy is the soft-spoken one as compared to literally everypony else. But she is particularly contrasted with Rainbow Dash and Pinkie Pie, who are the most energetic.
- Rarity is also soft-spoken in comparison with Pinkie and Dash, unless she's throwing a dramatic crying fit or tantrum.
- The titular Phineas and Ferb are step-brothers, Phineas is an overly enthusiastic Genki Boy and Ferb is The Quiet One who speaks about Once an Episode, but they make a great team.
- Raven and Beast Boy from Teen Titans and Teen Titans Go! are best friends in the original 2003 cartoon and love interests in the Go reboot/spinoff. Raven is a reserved goth-ish girl who was taught from a young age to avoid excessive excitement, while Beast Boy is an energetic keet of a boy who likes fun.
- Transformers: Generation 1: Siren is an exuberant Autobot with No Indoor Voice. His Headmaster partner Quig is a very quiet former librarian who jumps whenever Siren begins to speak in his ear-splittingly loud voice.
- Hanna-Barbera's series 2 Stupid Dogs are composed of the excitable but loopy Little Dog, who comes up with hare-brained ideas explained by Insane Troll Logic; and The Stoic but dim Big Dog, who goes along quietly with his companion's lunacy because he can't think of anything better to do.