A character with Situational Sociability is someone whose ability to socialize with others can vary depending on the circumstances.
A Shrinking Violet who can barely get two words out in a face to face conversation might display a whole other personality if put into a situation where they can communicate without having to actually face the other party, such as online or over the phone. In the right circumstances, the quiet violet can be as talkative and excitable as the next person.
There are variations. A person might be more confident or social when posing as someone else or in a Secret Identity. Superhero characters may have this as part of their superhero persona, such as being a bigger ham as a hero when normally meek as a civilian. Some may simply be more confident compared to when going about their normal lives. Others may deliberately cultivate such an attitude in the process of Clark Kenting.
Another variation is someone who rarely engages in conversation may become incapable of shutting up if someone brings up just the right topic. Alternatively, a person may not be a Shrinking Violet at all, but still present a fake persona to the outside world while displaying their true personality via another medium. There's also the inverse of the Shrinking Violet, someone who is easily social in most circumstances may freeze up if taken out of their comfort zone.
The core element of the trope is that the individual's attitude changes drastically in private compared to in public or when able to speak anonymously.
Can overlap with A Darker Me and G.I.F.T., when a character exhibits traits they would not normally show when they think they can get away with it or are otherwise made to lose their inhibitions. See also Beneath the Mask, which goes along with the "public persona" variation of this trope. This trope is applied when the hidden persona is actually expressed in some fashion. Cannot Talk to Women is a subtrope where the specific trigger that causes the change in social skills is the presence of the opposite sex.
- One public service message about cyberbullying has three schoolgirls and one mother prepare for a party in the mother's kitchen. Talk among the girls seems normal, until one girl starts speaking her online sentences, which are snarky and sniping. The others notice with increasing disquiet. Ultimately, the online sniper gets excluded from the party, and becomes a pariah at school.
- Meru Otonashi of Sayonara, Zetsubou-Sensei is incapable of getting a word out of her mouth in most social situations. Give her a phone, however, and she'll flood you with scathing text messages and emails.
- Tiger & Bunny
- Ivan Karelin is insecure and timid about his role as a Hero. When in costume as Origami Cyclone, he becomes a Large Ham.
- Doctor Saito is a variation. He isn't shy, but so quiet that his dialogue has to be subtitled. Over a PA system, he's as talkative, if not more so, as anyone in the cast. In the final episodes he gets around this by wearing a hat with a speaker and mic attached.
- Cromartie High School's Kiyoshi Fujimoto runs an online message board where he's polite and patient even as he's being trolled. In person, he is an violent delinquent with a Hair-Trigger Temper (which results in him unknowingly beating up that same troll just for accidentally running into him).
- Himouto! Umaru-chan:
- The main character, Umaru, presents herself as a cool School Idol in public, but is very lazy, messy, and bossy when at home around her brother and his acquaintances. The difference is demonstrated by Umaru going from a normal looking girl outside to a Super-Deformed childlike form as soon as she enters her home.
- Kirie has a hard time socializing with others in her class or outside her family. The exception is children, with whom she is much more at ease. She can barely speak to Umaru at school, but when she meets the Super-Deformed Umaru at her home, Umaru convinces Kirie she is Umaru's little sister, Komaru, and Kirie can speak to her much more freely.
- In New Game!, Hifumi is a Shrinking Violet when speaking directly with her co-workers, However, she is far more "vocal" and expressive when speaking in private messages. The anime's "Do It Yourself" Theme Tune includes this trait as Hifumi can't quite sing her part and instead runs to her keyboard to do it.
- Batman is an inversion of the example in the trope description. Bruce Wayne presents himself as a personable playboy, but Batman is very difficult to talk to.
- The character in Phule's Company code named "Mother" was literally scared of the sound of her own voice as a child, causing a stutter and, while growing up, teasing that rendered her incapable of conversation. Her original codename was even "Violet". When wearing sound blocking headphones, she discovered she could talk normally. Her job prior to joining the Legion was a radio DJ until they automated. Upon this discovery, Phule recommends her to permanent Comm Center duty, where she brings her radio DJ personality to the fore.
- In the Discworld novel Maskerade, the true Opera Ghost proves to be this. Socially awkward at best on his own, when he wears the mask of the Opera Ghost he's a confident producer of opera. Agnes receives coaching from him without ever learning who he really is and, after some headology from Granny Weatherwax, he's able to act like the "Ghost" all the time.
- In Mercedes Lackey's Secret World Chronicle, Victoria Nagy has to constantly fight down panic attacks when she's outside her apartment or facing people. However, when running Overwatch, which she can do alone from inside her apartment, she becomes as confident and sassy as anyone.
- Redwall's Broggle has a massive stuttering problem, so he doesn't talk much. Once it's noticed he doesn't stutter at all when singing, he gets over the block and manages to speak normally.
- Friends: when Chandler and Monica get invited to dinner by his boss, Chandler warns Monica that he's going to be "Work Chandler" instead of regular Chandler while they're there, which includes laughing at his boss's stupid jokes.
- On the early seasons of The Big Bang Theory, Rajesh suffers from selective mutism towards women. Around the guys he can hold his own in a conversation, but once a girl comes in he becomes withdrawn and can only talk by whispering into someone's ear. He is able to talk to women when drunk, adopting a more charming persona after a few drinks, but if he gets too drunk he enters Casanova Wannabe territory.
- In Noah and Saskia, Saskia is confident- even brash- in her daily life, but she's terrified of performing in front of crowds. This is an early sign of just how important music is to her.
- Ulrira, the old man who acts as your Hint System in The Legend of Zelda: Link's Awakening will give you plenty of advice over the phone. When you see him in person, he barely speaks at all. When he does speak it's a request for you to call him via phone instead.
- Persona 4: Dancing All Night has two Kanamin Kitchen idols Nozomi Nakahara and Tomoe Sayama who are Shrinking Violets when they're not publicly performing as idols.
- Fluttershy starts My Little Pony: Friendship is Magic barely being able to introduce herself. She gets past the worst of this as part of natural character development, but the episode "Filli Vanilli" shows off that she is a talented singer who suffers Stage Fright. When a member of a quartet she's a fan of becomes ill, rather than replace the sick pony directly, Fluttershy sings behind a curtain while her counterpart lip synchs. She is far more energetic and excited than normal when singing behind the curtain, which encourages her to start working on her stage fright properly.
- Adrien in Miraculous Ladybug isn't a Shrinking Violet, but he becomes a lot more playful and flirtatious when in his Chat Noir Secret Identity.