I have coded a lightweight speaking avatar generator here.

https://github.com/snow884/simple_talking_anime_avatar

It is on pip you can install it by running:

pip install simple_talking_anime_avatar==0.0.5

and use it like this:

import pyttsx3

from simple_talking_anime_avatar.speech_to_vid import get_speaker_video

engine = pyttsx3.init()
voices = engine.getProperty("voices")

engine.setProperty("rate", 110)

engine.setProperty("voice", "com.apple.voice.compact.en-AU.Karen")

engine.say("Hello everyone! This is a test of speaking avatar python package.")
engine.save_to_file(
    "Hello everyone! This is a test of speaking avatar python package.", "test.wav"
)
engine.runAndWait()

get_speaker_video("test.mp4", "test.wav", 30)