You can delete a Roblox account by simply emailing the company, but there are a few other ways to do it.

Once they’ve verified some information, they will then delete your Roblox account permanently. Be ready to verify your Roblox username and identity by giving them your email ID.

Roblox allows all users to change their Roblox account's display name in the account settings without spending a dime. Here's how to do it.

How Can I Change My ROBLOX Display Name? You can change your Display Name for free, once every seven days. This is how other players see you in-game and isn’t unique to one player.