From a technical standpoint, its equally easy to add text to either still or animated pictures. Its essentially the same tool.
I made this test image:
So if you want it written as a full horizontal sentence, the low opacity text only worked in the top right corner because that's the place where the background doesn't get too busy with moving objects or colors. Yet I personally don't think its a good spot for a text, and it doesn't look too good. I can try other spots if you have something in mind. I added the same text on Harley to show how it can get difficult to read very easily.
On the Joker you have two ways we could make this work. Either it becomes a four-line text, then it can be low-opacity because his jacket is a nice background, or we could make it very visible and give it a thick border to distinguish it from the busy background, then it can be a horizontal sentence.
The opacity, font size, font type, and font color can all be changed. I just went with what I had on default to show an example. Its also possible to animate the text; make it change color or fade in/out. I'd personally go with the four-line text. Make the first and third line centered and smaller, maybe with a different font, and keep the second and fourth lines the same. Alternatively, I'd go with the thick bordered one. That one is easier to place wherever you want.
As for your current avatar, its size is 150x111. Its width, 150, is already the maximum size the board permits. The height is about half what the board allows. I can't just increase the height and leave the width as is.. so the only way around that is to crop the sides and enlarge the whole thing. This is how it would look like with the maximum size, parts of the sides have been cropped:
If you have it in an animated format, I could do the same thing to it.
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