How to tell the difference between Ne-Si and Se-Ni in my sister.

I’ve been typing everyone in my family, but I’m having trouble with my sister. She’s 16 (I’m 18). I’d like to know how she ticks, because she always has the advantage over me, and I’m sick of it. I think knowing her type will help me.

My sister is creative. She likes to draw, build websites, and write small programs. She’s probably the best at all of this in school, but because she finds her friends embarrassing, she doesn’t advertise her artistic ability as much. She seems to care a lot about her reputation in general, and she’s well liked, but struggles to form friendships because she’s not emotional and never shares her feelings.

Although she is nice, my sister is very manipulative and competitive. She says she’s a Hufflepuff, but I’m certain she’s a Slytherin and just saying that to control how people view her. I love my sister, but if you stand in her way, she’ll manipulate friends and family to get what she wants and they always believe her. She’d never hurt anyone emotionally or physically, but she’s a bit of a schemer and always wins in the end. Someone tried to bully her last year, and she went to the bully’s friends and convinced them to keep them away from her. The bully despises her, but social pressure has prevented her from ever doing anything about it. That’s the kind of manipulative power she has. None of her friends are able to do this, and get teased constantly for being weird, but nobody dares cross her.

My sister is about as smart as I am, but it’s hard to compare because she’s very lazy about school. She hates math and science class and says she hates working for an answer. My sister has never cheated in school, and hates when teachers accuse her of cheating. It’s happened multiple times, even in cases where I know she did the work they are accusing her of not doing. She has an antagonistic relationship with authority: ask her to do something, and she’ll do it. Tell her to do something, and she just won’t. She tells me she sees teachers as the enemy, and I’ve noticed she won’t talk to or even look at a teacher if she can avoid it.

She’s vain. She spends about an hour and a half getting ready each morning and only likes expensive, quality items. She won’t date any of our classmates since most of them do drugs, are religious, or unlikely to make more than minimum wage. It frustrates my mother, who thinks she may never have grandkids since I don’t like kids, but my sister says she wants kids, but only when she can financially afford them, and as a high school student she is unlikely to meet anyone who she’d later marry.

Like I said. Fucking ruthless, and she treats relationships like business transactions.

In her free time, my sister likes to research on the internet, debate on internet chat forums, play strategy and simulation games, like business management games and the sims. She also draws, reads manga, and watches Korean television. She likes to hang out with her friends, but dislikes sitting around with them since the only interests they seem to share is manga and drawing, and they don’t like the same manga she does. With friends or me, she prefers to walk around town, play at the park, or have sword fights in the backyard. She does like to talk about current events and stuff she read from books with me though.

She has no current dream or ambition, but she has no problem making well thought out plans. I’ve asked what she thinks she might want to do, but she isn’t sure since she wants to make a lot of money or marry into a lot of money, but she’d also like to enjoy whatever she is doing. Even though college seems like the best bet for her, our parents don’t want to pay for it, so I’m going to community college despite my grades for the first two years. I got into a big fight with our parents when I was a freshman about it, so she likely entered high school realizing it didn’t matter what grades she got anyway.

What type do you think she is? I think she might have Te-Fi, but I’m not certain if she has Ne-Si or Ni-Se.