I use Leonardo.ai and space.artspace.ai
Leonardo is the one that cost $60 per month, which is a bit steep, so I did a one time try, But you can go thru the credit pretty fast, because it takes about 4 tries before I get it right. It's a bit of a coin toss for the Ai to pick something, and you don't have total control. In fact it seems the more you specify it the crappier the outcome.
space.artspace I use to sharpen and specify the character and it does blend mode of really well known actors, and even a swap faces of people from your own stock photos.
Leonardo can also give it more realistic detail of the character looking less CGI.
I been using adobe after effect for several years, but the result and speed of using ai is off the chart. Not only that, but the accuracy of the result even if you are a sloppy artist that Ai is capable of compensating your skill, that anyone could do this. Fantastic as these results are, I am feeling a bit more useless, because there will be tons of wanna be artist stepping into this.