What specific traits or habits do people close to you recognize that would reveal an impostor trying to mimic you?

Nice try evil doppelgänger, nice try.

If I suddenly became a competent adult, I think it might tip people off.

What specific traits or habits do people close to you recognize that would reveal an impostor trying to mimic you?

They ask me what specific things would reveal themselves when they mimic me. Thats probably a red flag.

This is like one of those impossible "wife" questions with no good answer and no clean escape.

"Hey honey, if a clone of me ever replaced me, you'd be able to tell the difference right."

"Of course dear"

"Well how"

"Umm, how about XYZ"

"What if they copied XYZ too"

"ZYX?"

"ZYX! Is that what you think of me!!"

Well, I shoot myself in the head a lot. It's a habit I'm trying to -- whoops! There I go again.

Same. I am anxious that the alien dopplegangers will figure this out, though.

Don't answer this you fools!

Nice try, shapeshifting doppelganger. I already have one evil twin, thanks.

I am unable to speak using contractions.

Data? Or Lore????
- gotta be Data. Lore could do it.

Nice try AI.

If I ate something in silence, my partner would likely notice something was off immediately. The sound of even my own chewing (mouth closed, ofc) triggers my misophonia

I joke sometimes that if I had an evil clone you could find out which one of us it was by looking at our left arms; mine is slightly crooked because of a childhood injury

Personally, I never have my radio on in the car and I near-always back into parking slots.

I make people answer Newlywed Game type questions with me, designate secret meeting spots and places to look for secret messages from me, and make up elaborate backstories just in case.

The way I pronounce the word "sorry" as well as my inflection whenever I'm speaking. Only my close friends whom I speak to in private know what my voice sounds like.
There are words I've made up that I jokingly use around friends. An impostor would not know about this as I speak to my friends privately and I never join chat servers, where bad actors could be eavesdropping. A wrong answer or "I don't know" would out them as an impostor.
My art. I will deliberately make "mistakes" in my art that are subtle enough to not be seen by most people, but I will be able to tell if someone is trying to copy it. Map makers do something similar.
Other random details only my friends know about that'd immediately out an impostor once asked.

Re: bullet point 2, that’s called a familect if you weren’t already aware. I just love that word and that it’s a thing, because it feels like nobody really acknowledges how widespread it is. We just all walk around having our own secret languages only our loved ones understand.
- I didn't know about that but that was interesting to read about and now I know what it's called, thank you! 😃

Well this obviously depends on how well informed my impostor is. But I would say my choice of sushi or breakfast would be among things that could out the doppelganger. Also my choice of drinks, the drink would probably out the doppelganger faster than the food.

Food related patterns would be pretty strong indicators for me as well, I think.

I only eat after 4pm (sometimes only from 6-10 or so) and people comment when I actually eat earlier than that, especially breakfast. I almost never use condiments or salt (I’m on a very low sodium diet and have been most of my life; I don’t use salt outside of baking, and that’s half salt). Give my dopple unsalted fries and you’ll know right away.

Drinks would work well for me as well - coffee made a very specific way, or room temp water, mostly (I actively dislike cold and hot water).

Following your example, I never throw on a playlist or let my streaming app generate one. Albums all the way.

My Kiwi accent (despite not being in New Zealand), my abnormally dark irises, my teeth (nothing particularly unusual except a few have an odd shape), my honeymoon rhinitis, my distinct snoring when I sleep, my semi-snorty laugh, my uncanny ability to quote my favorite media, my asexuality (supposing someone were to try to tempt me in ways that would tempt anyone else), my talent in cryptography (or rather certain kinds), my art style, and how I elaborately express myself all come to mind.

Sorry, I have to ask about honeymoon rhinitis, you are allergic to traveling but only if you were recently married?
- Honeymoon rhinitis is a phenomenon where some peoples' nose gets stuffed up when aroused. It's similar to people who say they look at bright light and sneeze. If I'm near a crush, I sound like I have the sniffles.
Can i ask about asexuality? I've never heard it described in that way - actually, i guess I've never heard it described at all. I don't really know what my question is.
- The reason asexuality isn't misunderstood that well, I'm guessing, is because there are different forms of it.
  
  Many asexuals don't get turned on, and these are called non-libidoist asexuals. Many get turned on by people but are asexual because they don't get turned on by the act of co-pleasure. These are called libidoist asexuals. Some not only don't get turned on but are averse to what others would consider physical fulfillment.
  
  Unlike other orientations, where it's typically a fated circumstance, because asexuality pertains to a lack of what it refers to, it's equally possible to be born with asexuality as well as acquire it later. Someone not born with it could be rendered asexual, for example, through a virus... correct me if I'm wrong but I read somewhere that long covid had a symptom or two like that.
  
  In any category, you can also be asexual and still like companionship (romantic asexuals), or you might not (aromantic asexuals) since companionship is fulfilling another part of us.
  
  Suppose I was facing some kind of Journey to the West type of trial and someone wanted to tempt me, so they bring in some guys who they think are a surefire way to get me to become tempted. It's not a matter of self-discipline, it simply wouldn't work as they envisioned. I would walk right through them unaffected. That part of me is to physical temptation what a colorblind person is to color.