Hello vy189,
It sounds like you are hoping to create a Memoji without the white background, right? Are you creating your Memoji using the steps outlined here:
Use Memoji on your iPhone or iPad Pro - Apple Support
"How to create your Memoji
- Open Messages and tap the Compose button
to start a new message. Or go to an existing conversation. - Tap the Memoji button
, then swipe right and tap the New Memoji
button. - Customize the features of your memoji — like skin tone, hairstyle, eyes, and more.
- Tap Done."
Note, there is a difference between Memoji and Memoji stickers. Which of these are you creating? Does the white area cover up words if you use your Memoji as a sticker?
Regards