Dumbass' Guide to Homestuck Characters: Quirks.
Quirks are easily one of the hardest, yet most fun things about creating a fantroll if that's what you like to do. Some people it comes naturally but for many others it takes a significant amount of time to create something they are truly happy with. Hopefully these simple steps will help you when making your next troll's new quirk.
Step 1: Be readable
For the love of all that is good and holy in this world please make your fantroll's quirk very easily readable. A quirk shouldn't require a guide in order to read and should be accessible to anyone who is reading your quirk for the first time.
Step 2: Reflect your character
This is probably the easiest and most understandable step but never forget it. Quirks in most troll lore are seen as a way for people to distinguish themselves from one another and this should always hold true. Think of characters like Vriska, who's love of spiders and the number 8 drives her character, or Folkyl, who's voidrot has affected her speech patterns, or Kuprum, who is just a 4chan joke.
Step 3: KISS
Keep It Simple, Stupid
May be patronizing, but it's also a vital rule to follow for something like this that MAJORLY helps in the other areas.
Step 4: Be unique
This goes back to quirks being a feature of differentiation in troll culture. If you keep your troll's quirk unique, you'll be able to fulfill that part of the lore.
Step 5: Break any one of these rules
Any of em. Smash it to pieces. The key to all great things is that it looks at what it SHOULD do and doesn't follow them. Now while you shouldn't go out making an illegible quirk that's an amalgam of other character's quirk, none of whom are similar to yours, it does mean that you shouldn't feel obligated to follow all of these rules to a T. I ordered these steps in order from most to least important. Legibility should always be Point Number One as you need to keep in mind any dyslexic people who might be reading your quirk. Character reflection is also incredibly important but in ways you might think you're breaking this rule, you can follow it. KISS is always a good acronym to have on hand because it's very easy to go overboard, but don't be afraid to dip your toes into the water. And not being “unique” can be unique in and of itself. This isn't some be-all-end-all guide, it's got some play in it and use it as you see fit.