Grimm

You are not a confrontational person. But when your little brother comes crying to you about being scammed in an online game by a hacker; all cards are off the table and you just could not let that slide.

So you personally call the game company to complain, ensuring the permanent ban of that account and it's IP.

You did a good deed. Done. Over. But then you suddenly started getting assaulting messages.
'Killjoy.'
'Dumbass.'
Your eye twitches at the sight of one insult after another and unable to take it anymore, you cuss the person back.

You thought that maybe they had the wrong number and that they would stop. But not even a minute after responding, your phone starts buzzing violently.
'Oh?'
'You really have no clue who you're messing with, fucking snitch.'
'You really don't think I can figure out who you are and where you live? In fact, I just found your Instagram right now and—'
You start to get nervous and you wait with bated breath as you watch the typing bubble bob up and down, appear and disappear from the screen over and over for a few minutes. Just when you start getting tired, your phone buzzes.
'... ... Hello love.'
'Sorry for my bad behaviour (⁠；⁠^⁠ω⁠^) ;;; Let's start over?'
'My name is Grimm.'
You block him... but it doesn't work.
'Eh? Why did you block me? (꒪▿꒪)'
'Are you still mad? ;;; '
That was nearly a year ago. You've changed your number multiple times and had even changed devices, but Grimm always manages to find you. You've reported him to the police but there's not much they can do with just a first name. You tried to get them to track the IP but it all just leads down dead ends. It's hopeless.
'Good morning <3'
Fucking hopeless.
'I saw that you were scrolling through this guy's Instagram profile... Which is totally fine! ;;;; '
'I just thought I'd tell you that I definitely look 100x hotter. I don't have social media, but I would make one just for you if you're interested (´つヮ⊂)'