Tags
These are some of the most popular tags used in the collection.
- _____tale Sans | Ink (Undertale)
- 1920s
- 20th Century
- Abandoned Work - Unfinished and Discontinued
- Abuse
- Acceptance
- Action/Adventure
- Adventure
- Adventure & Romance
- Affection
- Alpha/Beta/Omega Dynamics
- Alternate Timelines
- Alternate Universe
- Alternate Universe - 1920s
- Alternate Universe - Canon
- Alternate Universe - Canon Divergence
- Alternate Universe - College/University
- Alternate Universe - Core Frisk (Undertale)
- Alternate Universe - High School
- Alternate Universe - Historical
- Alternate Universe - Mafiafell (Undertale)
- Alternate Universe - Mobfell (Undertale)
- Alternate Universe - Outertale (Undertale)
- Alternate Universe - School
- Alternate Universe - Underfell (Undertale)
- Alternate Universe - Underswap (Undertale)
- Alternate Universe - Undertail (Undertale)
- Angst
- Angst and Hurt/Comfort
- Angst and Romance
- Anxiety
- Anxiety Attacks
- AO3 Tags - Freeform
- Bad Puns
- Bad Spelling & Grammar
- Bara Sans (Undertale)
- BDSM
- Best Friends
- Big Sans (Undertale)
- Birthday
- Biting
- Blades
- Blood
- Blood and Gore
- Blood and Violence
- Blood Kink
- Bonding
- Breaking the Fourth Wall
- Broken Bones
- Bullying
- Character Death
- Child Abuse
- Chubby Reader-Insert
- Cities
- Complete
- Concussions
- Confidence
- Consent
- Consent Issues
- Cooking Lessons
- Creepy
- Crimes & Criminals
- Cuddling & Snuggling
- Dancing
- Dancing and Singing
- Death
- Denial
- Denial of Feelings
- Depressed Reader-Insert
- Depression
- Desperation
- Dogs
- Dom Sans (Undertale)
- Dom/sub
- Domestic
- Domestic Fluff
- Dominance
- Dominant Character
- Don't Like Don't Read
- Dreamtale Nightmare Sans (Undertale)
- Dreamtale Sans | Dream (Undertale)
- Dubious Consent
- Ecto-Genitalia (Undertale)
- Ecto-Penis (Undertale)
- Ecto-Tongue (Undertale)
- Education
- Emotional Hurt/Comfort
- English Is Not The Author's First Language
- Error Sans (Undertale)
- Established Alphys/Undyne (Undertale)
- Established Relationship
- Eventual Happy Ending
- Eventual Relationships
- Eventual Romance
- Eventual Smut
- Evil W. D. Gaster
- Explicit Language
- Explicit Sexual Content
- Familial Abuse
- Family
- Fantasy and Fictional Setting Racism
- Fast Burn
- Female Characters
- Female Homosexuality
- Female Protagonist
- Female Reader-Insert
- Female Relationships
- Fights
- Fingerfucking
- First Kiss
- Firsts
- Flashbacks
- Fluff
- Fluff and Angst
- Fluff and Humor
- Fluff and Hurt/Comfort
- Fluff and Smut
- Found Family
- Fourth Wall
- Friendship
- Frisk (Undertale) Is a Sweetheart
- Frisk (Undertale) Needs a Hug
- Frisk Can't Speak (Undertale)
- Frisk Remembers Resets (Undertale)
- Funny
- Gangsters
- Gay
- Gay Character
- Gender-Neutral Reader-Insert
- Glasses
- Good Parent Toriel (Undertale)
- Good Parenting
- Gore
- Gun Violence
- Guns
- Happy Ending
- Harm to Children
- Hate to Love
- Head Injury
- Headcanon
- Heart Sex (Undertale)
- High School
- Historical
- Homosexuality
- Horror
- Human/Monster Romance
- Humor
- Hurt/Comfort
- I Can't Believe I Wrote This
- I Tried
- I Was Drunk When I Wrote This
- I Wrote This Instead of Sleeping
- I Wrote This While Listening to Mitski's Music
- I'm Bad At Summaries
- I'm Bad At Tagging
- I'm Sorry
- Identity
- Identity Issues
- Implied/Referenced Abuse
- Implied/Referenced Child Abuse
- Implied/Referenced Rape/Non-con
- Implied/Referenced Self-Harm
- Injury
- Jealousy
- Killing
- Kissing
- Language
- Lesbian Character
- LGBTQ Character
- LGBTQ Female Character
- LGBTQ Themes
- Light-Hearted
- Love
- Magic
- Magical Pregnancy
- Mating Cycles/In Heat
- Mental Health Issues
- Mettaton EX (Undertale)
- Mildly Dubious Consent
- Minor Alphys/Undyne (Undertale)
- Multiple Endings
- Multiple Pairings
- Multiple Relationships
- Multiverse
- Murder
- Mute Frisk (Undertale)
- Mutual Pining
- My First Undertale Fanfic
- My First Work in This Fandom
- My First...
- No More Resets (Undertale)
- No Smut
- No Use of Y/N for Reader-Insert
- Non-Consensual
- Non-Traditional Alpha/Beta/Omega Dynamics
- Nonbinary Character
- Nonbinary Frisk (Undertale)
- Not Canon Compliant
- Not Suitable/Safe For Work
- Oral Sex
- Organized Crime
- Original Character(s)
- Other Additional Tags to Be Added
- Outdoor Sex
- Outertale Sans (Undertale)
- Papyrus (Undertale) Being Papyrus
- Parent Toriel (Undertale)
- Parent W. D. Gaster
- Parenthood
- Peace
- Pining
- Plot
- Polyamory
- Polyandry
- Polygamy
- Porn
- Porn With Plot
- Possessive Behavior
- Post-Traumatic Stress Disorder - PTSD
- Post-Undertale
- Post-Undertale Pacifist Route
- Post-Undertale Pacifist Route - "I want to stay with you."
- POV Alternating
- POV Multiple
- Praise Kink
- Pregnancy
- Prejudice Against Monsters (Undertale)
- Protective Sans (Undertale)
- Puns & Word Play
- Queen Toriel (Undertale)
- Racism
- Rape/Non-con Elements
- Reader Is Not Chara (Undertale)
- Reader Is Not Frisk (Undertale)
- Reader is not Frisk or Chara (Undertale)
- Reader Remembers Resets (Undertale)
- Reader-Insert
- Reader-Insert Wears Glasses
- Reader-Interactive
- Reader/Underfell Sans (Undertale)
- Relationship(s)
- Romance
- Sad
- Sad and Happy
- Sad with a Happy Ending
- Sans (Undertale) Needs a Hug
- Sans (Undertale) Remembers Resets
- School
- Scientist Sans (Undertale)
- Scientist W. D. Gaster
- Scratching
- Self-Harm
- Sex
- Sexual Content
- Sexy Times
- Short Reader-Insert
- Shy Reader-Insert
- Shyness
- Siblings
- Siblings Papyrus and Sans (Undertale)
- Skeleton Puns
- Skeleton Sex (Undertale)
- Skeletons
- Slow Build
- Slow Burn
- Slow Romance
- Slow To Update
- Smut
- Smutty
- Social Anxiety
- Something New Sans | Killer (Undertale)
- Soul Bond
- Soulmates
- Spelling & Grammar
- Spoilers - Undertale Pacifist Route
- Stalking
- Stargazing
- Stars
- Stupidity
- Supernatural Bonds
- Supernatural Elements
- Swearing
- Sweet
- Swords
- Teasing
- The Author Regrets Nothing
- The Underground (Undertale)
- This Is STUPID
- This Is Why We Can't Have Nice Things
- Time Loop
- Time Travel
- Timelines
- Toriel Needs a Hug (Undertale)
- Trauma
- True Love
- Tsunderes
- Underfell Grillby (Undertale)
- Underfell Papyrus (Undertale)
- Underfell Sans (Undertale)
- Underfell W. D. Gaster
- Underswap Sans (Undertale)
- Undertale Alternate Universes
- Undertale Monsters on the Surface
- Undertale Pacifist Route
- Undertale Saves and Resets
- Undertale Spoilers
- Vaginal
- Vaginal Fingering
- Veteran Grillby (Undertale)
- Violence
- W. D. Gaster is Papyrus and Sans' Parent
- Wake-Up Sex
- Weapons
- Why Did I Write This?
- Wow
- Xenophobia
- XTale Chara (Undertale)
- Xtale Sans | Cross (Undertale)
- XTale Sans | Cross Needs a Hug (Undertale)
- XTale W.D. Gaster