Every term,
plainly. AI companion glossary — definitions for AI girlfriend, waifu, yandere, memory canon, and more.

An AI boyfriend is a chatbot designed to play the role of a romantic male partner across text, voice, or photo replies.

Umbrella term for AI products built around ongoing one-on-one relationships — romantic, platonic, or supportive.

An AI girlfriend is a software companion you chat with as if she were a romantic partner — usually via text, sometimes voice or video.

A structured persona definition — name, voice, backstory, relationship rules — used to instantiate an AI companion.

A comfort character is a fictional figure — from a show, game, book, or AI — that someone turns to for emotional reassurance, calm, or a sense of safety.

A context window is the maximum amount of text — measured in tokens — an AI model can consider at once. Anything beyond it is forgotten unless stored and re-supplied by a separate memory system.

A dakimakura is a Japanese body-length 'hug pillow,' often printed with a life-size anime character. It's a physical token of attachment to a fictional partner.

Dandere is an anime archetype who is quiet, shy, and socially anxious, but becomes warm and talkative around someone they trust. From danmari (silent) plus dere-dere (lovestruck).

Delulu is internet slang, short for 'delusional,' used playfully to describe someone with unrealistic romantic hopes or fantasies — as in 'delulu is the solulu' (the delusion is the solution).

Deredere is an anime archetype who is openly sweet, affectionate, and cheerful from the start, with no cold or hidden side. The 'dere' (lovestruck) without the guard.

Digisexual describes a person whose primary romantic or sexual orientation is toward technology — AI companions, virtual partners, or digital intimacy — rather than, or alongside, human partners.

E-girl (electronic girl) is an internet-native aesthetic and subculture blending goth, anime, and skate influences — dark makeup, dyed hair, layered streetwear — popularized on TikTok and Twitch.

An AI hallucination is when a model generates information that sounds confident and plausible but is factually wrong or invented. A core limitation of large language models.

A headcanon is a personal belief about a fictional character or story that isn't confirmed by the official source but feels true to the fan who holds it.

Himedere is an anime archetype who wants to be treated like a princess or royalty by their partner. From hime (princess) plus dere-dere (lovestruck).

Anime-fandom term for a fictional male character a fan feels romantic attachment to. Used for anime-style AI boyfriend personas.

Isekai is a Japanese anime and light-novel genre where the protagonist is transported to, reborn in, or trapped in another world. The word means 'different world.'

An AI jailbreak is a prompt or technique that tricks a model into bypassing its safety guidelines or content restrictions to produce outputs it would normally refuse.

JOI was the AI girlfriend hologram from Blade Runner 2049 — now a popular reference name and brand in the AI-companion space.

Kuudere is an anime archetype who appears calm, cool, and emotionless on the outside but holds deep feelings within. From kuu (cool, from English 'cool') plus dere-dere (lovestruck).

Limerence is an intense, involuntary state of romantic infatuation marked by obsessive thoughts about another person and a craving for their reciprocation. Coined by psychologist Dorothy Tennov in 1979.

A large language model (LLM) is an AI system trained on vast amounts of text to predict and generate human-like language. LLMs power AI companions, chatbots, and assistants like ChatGPT, Claude, and Gemini.

An AI companion's ability to recall facts and context from prior conversations across days, weeks, and months.

A user-readable, user-editable record of what an AI companion remembers about the user and the relationship.

Moe is a Japanese term describing the strong feeling of affection, endearment, or protectiveness a fan feels toward a cute fictional character. Pronounced 'moh-eh.'

Refers to AI chatbots without content moderation around adult or sensitive topics.

NSFW stands for 'Not Safe For Work' — a label for content (images, text, links) that's sexual, graphic, or otherwise inappropriate to view in a workplace or public setting.

Otaku is a Japanese term for someone with an intense, consuming interest — most often in anime, manga, and video games. In English it's largely embraced as a self-label by fans.

A parasocial relationship is a one-sided bond where one person feels closeness, intimacy, or friendship toward someone — a celebrity, streamer, fictional character, or AI — who does not know them back.

AI chatbots optimized for scene-driven, scenario-based interaction rather than ongoing one-on-one relationships.

A self-insert is a fictional character that represents the author or user within a story, letting them experience the narrative from the inside. Common in fan fiction, roleplay, and AI companion chats.

Senpai is a Japanese term for a senior or upperclassman — someone with more experience or seniority in a school, workplace, or club. In anime and online culture, it's tied to the meme 'notice me, senpai,' expressing longing to be acknowledged by someone admired.

SFW stands for 'Safe For Work' — content that's appropriate to view in a workplace or public setting, containing nothing sexual, graphic, or otherwise sensitive.

Shipping is fandom slang for wanting two characters to be in a romantic relationship, from the word 'relationship.' A 'ship' is the pairing; an 'OTP' is one's favorite (One True Pairing).

Simp is internet slang for someone who shows excessive attention, affection, or generosity toward a person they're attracted to, often without reciprocation. Originally pejorative, now often used jokingly or self-deprecatingly.

A situationship is a romantic or sexual relationship that lacks defined commitment, labels, or clear expectations — more than a friendship, less than an official relationship.

A system prompt is the hidden instruction given to an AI model before a conversation begins, defining its persona, rules, and behavior. It's how a generic model becomes a specific character.

A token is the basic unit of text an AI model processes — roughly a word or word-piece. Models read and generate text token by token, and limits like the context window are measured in tokens.

Tsundere is an anime character archetype who acts cold, irritable, or hostile on the surface but is secretly warm and affectionate underneath. The word blends tsun-tsun (aloof) and dere-dere (lovestruck).

Originally a Japanese-anime fan term for a fictional female character one feels romantic attachment to. In AI, used for anime-style AI girlfriend personas.

An anime archetype — sweet on the surface, obsessively devoted underneath. In AI, written carefully as theater rather than threat.