Oldest First: Arrested Development:
I think the best character on arrested development is a tie between Gob Bluth and Tobias Funke. The awful magician tricks, stupidity, stripper pants, and sexy "club sauce" voice make Gob a shoe-in. While the jean short cut-offs (never nude) and obviously gay mannerisms and comments, make Tobias a contender as well.
In a close second is Lucille Bluth. What's not to love about an unemotional, selfish, alcoholic old woman? Lucille wins the "Worst Mother of the Year" award, but her character is hilarious. There is never a dull moment when she is on the screen.
Modern Family:
I think the best character is Phil. Oh Phil...... What can I say? He is everything in a character and more.
However, Cameron is a favorite as well. Cameron's neediness, his drama queen personality with a just touch of sporty masculinity, and outfits make him a joy to watch. His character definitely adds to the show.
Oh I don't know, I can't choose. Which is your favorite and why?