It's easy to change Alexa's voice if you want your Astro robot to have a different accent. A total of nine English accents are available to choose from.

The easiest way to switch between voice options is to say the command: "Alexa, change your voice.” From there the assistant will ask which of the voices you would like to choose.

You can also change it using the Alex app:

"If you prefer not to verbally ask Alexa to change voices, you can also switch accents via the Alexa app. With the app open, tap Devices on the bottom bar, then tap the Echo & Alexa icon. From there, select the device you want to switch the voice for (this setting is per device). Next, tap the settings gear icon on the upper right and then scroll down and look for and select Alexa’s Voice. Now you can select whatever accent you please without getting a warning message that you’re about to change your region.

If you have an Echo Show, you can change the voice right on its screen without needing to check the app on your phone or talk to it. Do that by opening Settings, going to Device Options, tapping Alexa Voice, and then selecting the accent of your choice."