Currently attitude changes don't do much except change or add some minor dialogue blocks. Down the line as the game is fleshed out and finished, it will likely affect the story's progress in certain ways.

Mr. Stein

• Increase
  • None, yet
• Decrease
  • Every time you insult him during his introduction

Dialogue differences:

At max (current) dislike he's curt with you in the class, and tells you to refer to him by last name or "Sir". If you weren't he says you can refer to him by first name and he believes respect is a two-way street.

-- Additionally, other characters will comment on how they saw him cry. This can trigger an attitude change in Colette, depending on how she feels about you at the time.

Colette

• Increase
  • Apologizing during hallway scenes
  • Responding positively to being best friends
  • Saying the expensive drink is a joke
  • BUG: It should increase when you buy mead
  • Calling her plan genius
• Decrease
  • Being rude during introduction ("I said what I said"/"She's overreacting")
  • When she asks you about Mr. Stein...
    • If her attitude of you is low she does not believe you if you lie, and her attitude goes down
    • If her attitude of you is high she'll believe you and her attitude does not change
    • If you admit the truth her attitude goes down
  • Being negative about being best friends (neutral responses don't change anything)
  • Making her buy the expensive drink
  • Calling her plan not genius

Dialogue differences:

She has different dialogue based on her attitude after your choice of calling her plan genius or not.

Easter Egg: If you reduce her attitude ~3 times during the hallway scene she says "you have been naughty thrice" in a quick non-canonical scene in reference to Dimension20.

Mean

If you take mean options - there aren't many - where you're intentionally rude a counter goes up that will change some dialogue in the future. For now the only major change is that Colette will call you out on being not a nice person. 

There are small easter eggs for the following names:

• Jay/Jon/Illestis bug: isn't currently working for 'Karuga'.
  • Tribute to admin/owners of Kanka
  • On meeting Ornstein, Colette, and Walblue 
• Waldue.
  • Tribute to user who beta-tested (and has a cameo)
  • On meeting Colette and Walblue
• Beef/Beefpotato.
  • Tribute to user who beta-tested
  • On meeting Colette and Walblue
• Max or Maximilian.
  • Reference to TFE
  • On meeting Colette, only.
• One extra-secret name
  • On character creation
  • On meeting Colette and Walblue

This is just a list of decisions that make important changes down the line. This does not list minor changes due to branches. For example Colette showing you the "OC do not steal" card is inconsequential in the grand scheme so it wouldn't be here.

Currently barren as Part 1 is just a minor introduction.

• Giving your mother koinks or not
• Character attitudes

This is not an exhaustive list because it's got far too many.

• Koinks - A fake cryptocurrency made as a joke
• Orn Stein - Ornstein, the dev
• Walblue - Waldue, a member of the Kanka community
• Colette - One of Ornstein's TTRPG characters
• MC's outfit is the default entity thumbnail for Kanka
• "Chrome dome at 19" - The dev is bald :(
• Hot-blooded transfer student - Common trope in anime/manga
• ASCEND - "Bangarang" being turned into "Kankapparang" was an in-joke on the Kanka discord
• "Original character do not steal" (Know your meme link)
• "I read the script" - RedLetterMedia reference, if a little roundabout
• Easter Egg: "you have been naughty thrice" - A reference to Dimension20 and Baron of the Baronees
• Meetcute - A common trope in romance movies where the lead couple meets in funny, cute, or unusual circumstances. 
• TFE - Tales from Everwhere, a campaign run in the Kanka community
• Kanka running with toast - Common trope in anime, where a character who is late for school runs with toast in their mouth. 
• "I see your value now" - Jeff and Abed have this exchange in Community.
• I am her father - Star Wars, of course.

In class and at the cafe a random blurb is shown.

Class Text

• Talking about D&D
  • Most of the Kanka community is dedicated to TTRPGs. That's it.
• Kingkiller
  • The dev's nickname -Ornstein - on the Discord mentioned his ambivalence to the series once. That's it.
• Dark Souls
  • Ornstein is a name taken from a boss of the game, and one of the dev's favourite games. Quelaag is the 2nd major boss, getting to here in ~1 hour is impressive to most new players.
• Colette glowing
  • Colette glows blue when she inhales magic in TTRPG games. It's deep-cut.
• Helmet under helmet
  • A reference to Naruto where Kakashi removed his mask to show another mask. It's also a common gag.
• Kankappy argued...
  • Reference to many backstory characters in TTRPGs having dead parents, and Kankappy's origins as a 'Clippy' type character
• Thaelia
  • Jay's homebrew world for his TTRPG games
• Community vote
  • The dev was a strong proponent to dynamic birthdays, something passed over in the community votes once or twice.
• SCP-type fan fiction
  • The dev has a setting that's along the same vein as SCP/Control and similar ideas. He submitted entries to events but never won to gain the 'wordsmith' title and has lamented (jokingly) it in the discord from time to time.

Cafe Text

• Colette on ceiling
  • Colette's character (in her first iteration) could walk on walls, ceilings, and floors through magic. That's it.
• Tall skinny...
  • Less a reference, more just poking fun at weird cafe orders.
• Body pillows
  • There were jokes about making Kankappy body pillows on the discord server
• Mixes
  • In Colette's first appearance in Tales from Everwhere she was with Max and Mox, who she referred to as the Mixes
• All walk into a cafe
  • A reference to other TFE characters