You can use Hotword Changer to access your Assistant (Your default assist app or whatever opens when you long-press the home button) with different hotwords.

Hotword Changer lets you use voice wake-up feature even when the screen is turned off.

By default, Hotword Changer will recognize you when you say like "Jarvis" etc. whenever the screen is on or your device is charging.

However, you can run it when the screen is off but comes at the cost of increased battery usage!
(Not recommended)

There are only six hotwords available right now:
* Alexa
* Computer (Star Trek?)
* Jarvis (Stark?)
* Marvin (the Paranoid Android?)
* Happy
* Sheila

(Your order will be refunded automatically if you uninstall the app with-in two hours.)

FAQs:

*Why it doesn't work in calls or other apps using the microphone?
Android doesn't allow two apps to capture audio at the same time to prevent latency issues. Android 10 solves this (kinda). If you are using a device with Android 10, make sure you turn off any other app using the microphone in the background (any!).

*Why it vibrates after saying the hotword but doesn't start Assistant?
Your phone restricts apps from starting other apps. Allow the Assistant to autostart.
(On Xiaomi phones, open recent screen > long-press the app window > Tap on lock)

*How can I add custom hotwords?
The current implementation requires thousand of recordings from different people & it's not efficient for custom hotwords. You can either write a review or use the send feedback button in the app to send the name you want.

*How about Voice Match feature?
Available soon...

Note:
*Simultaneous recording in apps is not allowed for third-party apps on Android (except Android 10). Hotword Changer makes this possible using a lot of hacks. Some features may or may not work.
*Make sure your home launcher doesn't have microphone permission.
*Feedbacks are appreciated.
*Devices not respecting "Android Foreground Services" will kill the app in the background. Check the OEMs website for possible solutions.

Permission notice:
Microphone: The app won't work at all because it needs to record what the user is saying.

Usage Access: Used to release microphone when any other app having recording permission is in the foreground (Not required on Android 10 & above).

Display over other apps: On Android 10 & above, apps can not start other apps without this permission. Hotword Changer won't be able to start your Assistant app. (Not required on pre-Android 10 devices).

Join the beta program & be the first to try out new features & help improve Hotword Changer.

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Additional Information