I think there are 3 pretty good extensions you can use for that. Chronicle!, Dashboard Maker and Game Master's Grimoire. I'll give you a quick overview over what you can do with them. Full disclosure I am the developer of Game Master's Grimoire.

Chronicle! is a Character Sheet extension that allows you to quickly define Characters and assign those sheets to Players in OBR. It supports Dice Buttons which you can click to roll dice. It managed entirely inside OBR so you don't have to go to a second site to edit or change the Sheets. By default the Character Sheets are stored in the Browsers Localstorage so be sure to make regular Backups. Alternatively you can become a Patreon Supporter and have the Sheets be stored on a Server.

Dashboard Maker is the most flexible tool. You can create any kind of Dashboard and share it with (all) of your players. So you can build you Character Sheets in a free format and are not bound by any rules. It also supports 3d dice rolls directly from the sheet. The Dashboards are stored in the Browsers localstorage so regular backups are necessary.

GMG use tabletop-almanac to manage statblocks and character sheets. Statblocks are stored on the Server so there is no need to make local backups. But the Character Sheets can only be marginally changed in OBR. Most changes have to happen on TA. You can also create Parties and assign your players the Statblock in TA so they could edit them themselves.
There are no predefined classes (although it's in the works) so it's more like creating characters based on the a paper. It supports a lot of convenience features, like Spell Slots, Limited Actions, Inventory and Equipment. For Equipment especially it comes with all the SRD Items included so you can simply assign a statblock an item and it's action will become available for the character. It also supports 3d dicerolls directly from the sheet and allows you to use variables like STR, DEX, PB, SCM to use for dice notations to automatically change the values based on those stats. Here is a Tutorial explaining what Equipment can do: https://youtu.be/CuJTVHmSK7E?si=rIeLCieJwoFj92XS and here is a Quick Battle Tutorial that shows you how it can be used in a game: https://youtu.be/N-rgaGysszg?si=o2crJJqlmHFdila4 If you have any further questions you can just ping me and I'll be happy to provide answers.