Yes, I think that Carlos Latuff can be considered to have sided with the revolutionaries in the Arab Spring, because his cartoons certainly reflect it. Latuff's cartoons are so political that they can almost be described as anti-Semitic. Based on his literature, he can clearly be deemed to have sided with the revolutionaries.
Carlos Latuff has consistently done work that is Anti-American. The Arab Spring was brought about by the forces of Al Quida that are anti-American and Carlos Latuff work has shown that the status quo is trying to shut down the voices of the revolutionaries. His cartoons show a general bias toward the revolutionary side.
Some of Carlos Latuff's images have been used by revolutionaries during the Arab Spring as groups rose up against despotic leaders. He has openly supported rebellions in Tunisia, Egypt and Libya while those conflicts raged. Since then, Latuff has commented on Western interference in the Middle East and Northern Africa and warns against counter-revolutions in those areas.
No, this cartoonist is not worried with a particular side, and does not care what is happening in this uprising. All he cares about is finding a topic that the public finds interesting, and making a comical cartoon that the people will enjoy seeing and will pay him good money for.
No, I don't think Carlos Latuff can be considered to have sided with the revolutionaries in the Arab Spring. The man is an editorial cartoonist (cute, too, by the way). There's a rich vein of humor to be found in mocking people who are acting like idiots. And there were a lot of government idiots in the hottest parts of the Arab Spring. So, they got mocked.