This is my first time playing dnd, we havent started the campaign yet so im still working on my character sheet. My character is a 7 ft tall cleric/bard tiefling with dark purple hair and faintly green skin. Think twink-ish mischievous performer type. I have most of my character sheet filled out but im stuck on what to name him. Any advice would be appreciated, https://xender.vip/ even if its unrelated to names because i am painfully uneducated on dnd.

Check the Dnd beyond base rules 

if not try the following If this a male character 

Bormethus

Polthemuy

Edgar 

Orblickron

if this is a female character try

Ballira

Shade

Rochelletita

Rina 

I have a friend that has a very similar character names Purple, if you want something silly maybe go with that?

Midnight?

I'm really bad with names, are they celestial vibes?

Starshine? Bro this is my first post/comment I'm trying my best

David the Poet Cleric

Dang bro he's 7ft? That's how tall my leonin is lol. Do Barakas, Morthos or Kairon sound right?

Nettie? I make a lot of joke characters.

Personally, I am very much against the notion of simply mashing syllables together to make a name. A name should come from somewhere. A name should represent an aspect of the character. There are a bunch of ways to do this. 

Look at literary sources. Your character is mischievous. So how about Puck. The name comes from the Celtic name for mischief fairies. Shakespeare's "A Midsummer Night's Dream" has a mischief character nicknamed Puck, whose real name is Robin Goodfellow. So how about Goodfellow? It gives people the impression that you are, in fact, a good fellow, but it is really just a cover - a disguise - for your true nature. If you're more into comics than Shakespeare, you could go with Quinn - an homage to the mischievous Batman temptress Dr. Harley Quinn. But the best Batman villain was the Joker, best embodied by the late Heath Ledger, whose greatest movie was "A Knight's Tale", in which he played Sir Ulrich von Lichtenstein. So maybe "Sir Ulrich" would fit. Again, it gives the impression of nobility, but like your namesake, it hides the true nature of the character. 

Then there are cultural sources to consider. Is there any real-world culture that is a close fit for your character? If there a style of dress that your character prefers that resembles a real-world culture? If you see your character wearing the brocade vests and regency coattails of Victorian fashion, then go with a Victorian-inspired name like Oliver Barkeley, Albert Abberton, or Ambrose Duke of Cranbrook. If you see your character wearing the colorful skirts and headscarves of Romani culture, with jewelry interlaces with dangling coins, then you can go with something like Nicu Yoska or Hanzi Gilavni. 

Similar to the cultural source is the geographical one. I've got a homebrew rule in my group that every gnome, whether a PC or an NPC, has to be named after two cities or towns in Australia. Seriously, just throw two darts at a map of Australia and you'll get a perfect name for a gnome character. Try something similar with a location you admire. Pull up Google Maps, pick a location famous for music, and look for your name - Baronne St. Charles, Zydeco Jones, or Ruby Habenera.

Your name isn't just a line on a character sheet. It's not just a bunch of letters. Your name is important. Your name is your interface with the world around you. More people will know your name than will ever know you. So put some thought into it and pick one that means something. 

is that you David the Poet Cleric?