I don't have any enemies. The closest I've ever had to one is now my best friend, another Fe-IEI.
Actually now that I think about it, it's kind of similar with all of my closest friends.
Ni-EIE - I initially disliked her, I felt like she was forcing her way into my circle of friends, I guess she kind of did. We became really close though (we even showered together lmao!), she lived with me for a few months, and she convinced me to break up with my SLI boyfriend in that time and she set me up with an SLE a few months after (though she also set me up with some obsessive beta NF creepy boy..yuck). She got into hard drugs though, and we're not friends anymore.
Fe-EIE - I HATED HER. Wasn't mutual at all though. She was just fucking annoying and perky and loud and invasive and wanted to be my friend and I just wanted her to shut the hell up and go away. My thoughts were always "WHAT THE FUCK IS SHE DOING HERE. GAAAHHHH. SHUT UP. I DON'T LIKE YOU. WHY DO YOU LAUGH ALL THE TIME.." etc etc. one time she came up to me and said something like "you know, you're the only person who I would let shank me! Someone else came up to me and they were going to and I was like NO ONLY JENNA CAN DO THAT LOLOLOL!!!" and I replied "okay." and walked away. I was so mean to her and she didn't do anything to deserve it, I just didn't like her. I lightened up a little though when she started dating my LSI friend, and I found out how vulgar and hilarious she could be. She knows I used to hate her and we laugh about it now, it's not a big deal or anything. When she was 9 months and 1 week pregnant we went lazer tagging, to try to induce labor