Atom20 is a Chrome extension that allows you to track Roll20 characters’ attributes. You can use it to build a bestiary and sync your Roll20 character's stats with Google Sheets. 

You’ll find two rows in the “Character Sheet” tab. The first row is the character name, and the second is the sheet name. By default, your character’s name is set to your Roll20 name. If you want your character’s name to be different, you can set that up in the “Character Name” cell. This way, you can have one sheet labeled as “My Name” and another one as “Monster Name”.

To add a button to your character sheet on Google Sheets, you need to go to the “Macros” tab, and add a cell to it. You’ll find three different types of buttons. The first one is the “Roll20 button”, which adds the Roll20 character’s stat block to Google Sheets. The second one is the “Create a character” button, which creates a new character and sets up its stat block on Google Sheets. And the third one is the “Set an attribute” button, which sets an attribute value on Google Sheets rows. 

You’ll be able to set the buttons’ attributes in the “Attribute” tab. By default, your character’s attributes are set to “None”. If you want to set it to “Int” or “Str”, you can enter that in the “Type” field.