In the 1st row I liked the idea of stretching the text to fit with the white area each time but when I used a smaller word it didn't really work.
The 2nd row uses a box method for the text and it works with any of the characters names, even the smaller ones. I could make the word which relates to the character stand out more, but in a subtle way.
And the 3rd row is the original method Alan suggests which works well, keeping it very simple.
After figuring out the look I began looking at fonts and there's two which I think could work. My favourite being Gill Sans Ultra Bold as it reads clear to the audience but also looks bubbly, relating to my round shaped characters.