Yes. If you're interested in creating multiple accounts with different niches to fully flesh out your brand, Twitch allows you to do so as long as you continue to adhere to their terms of service. Before creating your second account, make sure to click into your "Settings" tab from the website menu, select "Privacy and Security," and toggle on "Enable additional account creation." Doing so will ensure Twitch doesn't block you from using the same email for your new account.