And then I made a rough layout of how big everything would be with the final 1050x350 size that the website allows.
Then using the layout, I modeled the letters in Maya, and imported my Lou the Janitor Character. I also almost went with a black letter on white background, but it didn't look the way I wanted it to when I lit it. The background was constantly getting over-exposed, while the character looked dull. I like the way the character pops against the black background.
And finally, I animated it, lit it, rendered it, added a subtitle in After Effects, and made it into a gif.