Roll20 have a long list of available Character Sheets, and the majority of them on Roll20 are community-created. This page have info & suggestions on what you can do to increase your chances for a sheet being created. Roll20 Character Sheets are created with HTML/CSS & JavaScript, and involves some Roll20-specific code, which makes converting a character sheet from any other format into Roll20 impossible, and are therefore either created from scratch, or use an existing sheet as template.

Requests

A few words on the different types of requests.

List of Current Requests

Check the Sheet Request Thread(Mk II) for the list of current request for new character sheets. It's updated sporadically.

New Sheet

The best way to go about making a request for a new Character Sheet is checking the in the Sheet Request Thread(Mk II) if your sheet already have been requested, and if not, follow the steps in How to make things easier for Sheet Authors and post in the thread. If your sheet have listed in the first post, you can post and mention that you're also interested, and if possible, follow up with more info that the original request haven't provided.

The search field for character sheets

Remember to double-check your spelling if you search for a game in the in-game character sheet dropdown, as the sheet might be listed under a slightly different name. E.g. if you're searching for the Star Wars: Edge of the Empire game, you find nothing, but if you start by typing just "Star Wars", the dorpdown will list all Star Wars sheets, and you'll find that there are two Star Wars sheet with "FFG" in their name, so there are two general sheets for the Fantasy Flight Game's line of Star Wars RPGs (which include Edge of the Empire). This is the sheets you're looking for.

Another example is that all the AGE Sytem's sheets (Dragon Age, Fantasy Age, The Expanse) are bundled up in a single "AGE System"-sheet, which is mentioned in the sheet's instructions.

Translation of Existing Sheet

If an existing character doesn't have translation capabilities, you can post requests in the main Sheet Request Thread(Mk II) thread.

If a sheet already have translation capabilities, you can use this web form to get access to CrowdIn(translation service Roll20 uses so people can more easily submit translations), so you can submit translations for your language yourself.

You can also check out the ACSI-script that might be able to do a good portion of the work, or contact the scripts author Andreas J. to use it on a sheet.

Changes to Existing Sheet

If you want to petition a change or improvement to an existing sheet, it's recommended to make a new thread on the Character Sheets & Compendium Subforum , contact the active author( if one exists), and create an Issue on the Roll20 repository.

How to make things easier for Sheet Authors

If you want to improve the chances of a sheet request being fulfilled, there are a good number of things you can do make things easier, and lower the bar for anyone who might consider making your particular character sheet.

1. Be respectful. If you ask someone to create something for free, it should go without saying that you should be nice when asking. Majority of the character sheets are created by community members in their spare time, and it's not a simple process.

2. Give the exact name of the game system, and describe it's general mechanics, and mention if it shares similarities or is related to other known games. E.g: "The Expanse RPG" is based on the "AGE System" by Green Ronin; "DungeoneerD20" is inspired by "D&D 3.5E", Pathfinder and have a classless character creation like X

3. Give a good case for why the sheet is needed / why the game is interesting. Sheet authors who create sheets often do so out of some interest for the game, considering most sheets are created by people in their free time.

4. Linking to a digital version of the sheet. If a game have a hard to find sheet, it might never get done if you don't show how it looks like. Link to a pdf or image will help a lot.

5. Point to a similar or related sheet existing on Roll20. If you track down an existing character sheet that shares much with the requested sheet, a sheet author would potentially have an easier time to get started if there exist a solid suggestion to start from.

6. Mention/have ready macros and resources that have been used to play the game so far on Roll20. These macros can help in the sheet creation, quickly explain the game mechanics, and could potentially be used to create roll-buttons.

7. Be prepared to give detailed description of how the game is played/sheet is used. It saves any future sheet author's time, as they would otherwise need to spend time learning rules, instead of working on the actual sheet.

8. Link to any free rules available for the game. If the game have free, legal rules/quickrules available online, any sheet author could work easier on the sheet without needing to consult a person knowing the rules. If you're truly dedicated, you could provide legal copies of the gamerules to a sheet author if no free quickrules exist.

9. Consider approaching the game's community or the Publisher about your request. If it's a new or fairly new game, there is a chance that someone in the game's community or the publisher itself would consider getting a sheet created if they know that many are playing it online.

10. If you're a publisher, you can consider contacting Roll20 to seek a deal. Alternatively, you can post on the Character Sheet forums about wanting to have a character sheet made/commissioned.

11. Setting up a bounty or offering to pay someone to creating the sheet (Forum thread talking about the subject). If you're a publisher, or someone who really wants a sheet to get made, you could post a separate thread in this sub-forum to signal you are looking to commission a sheet, reply to this thread with a link to your post. (You can search the subforum for "commission" or "hire" to find past post on the subject and see how they turned out)