So guys, who was your favorite?

And to the gals...
Willy, Jonas, Thurston or Roy?

Mary Ann

For what it is worth, Gilligan's first name was never mentioned during the show.

I agree but because many of the current generation have no idea who these people are I referenced the wiki for first names.

Also Lovey is not Mrs. Howell's first name either.
Her first name was 'Eunice'.

Willy Gilligan (portrayed by Bob Denver) – The title character of the sitcom. Gilligan is a crewman of the S. S. Minnow who worked for the Skipper. He is well-meaning but bumbling, and he always seems to inadvertently mess up the castaways' escape. He wears a red shirt, light blue pants, and a white sailor's hat. His first name is never mentioned on the show; he is referred to only by his surname of "Gilligan."

Cpt. Jonas Grumby (portrayed by Alan Hale Jr.) – Referred to on the series only as "The Skipper," he is the captain of the S. S. Minnow. He is portly, leading to numerous fat jokes from Gilligan. Such an instance is when the Professor and Gilligan are helping him into a wetsuit: the Skipper says that he just has big bones, to which Gilligan adds: "and they're covered in big meat." Whenever he gets frustrated with Gilligan, he swats him in the head with his hat.

Thurston Howell III (portrayed by Jim Backus) – Thurston is a millionaire used to luxurious living and never does any work on the island. The only exception is when the castaways believe that Mr. Howell is broke and make him work. He devises many get-rich-quick schemes on the island. Thurston was originally a multi-billionaire until the stock market crash rendered him a multi-millionaire.

Eunice "Lovey" Howell (portrayed by Natalie Schafer) – Thurston's wife. She can be more spoiled than Mr. Howell at times, but is always the first to want to try something new. Mr. Howell always calls her "Lovey". Her maiden name is Wentworth.

Ginger Grant (portrayed by Tina Louise) – A Hollywood movie star. Ginger usually tries to use tricks from the movies she starred in to solve problems causing other castaways to rescue her from any dangers that befall her. She helps Mary Ann with cooking and dishwashing.

Roy Hinkley, Ph.D. (portrayed by Russell Johnson) – Referred to on the series only as "The Professor," he was actually a high school teacher and scout master before being stranded on the island. He has numerous scientific degrees and uses his knowledge to build many things on the island out of available materials.

Mary Ann Summers (portrayed by Dawn Wells) – A farm girl from Winfield, Kansas. Not much is known about her before she gets to the island. She is portrayed as a typical "girl next door" and does most of the laundry and cooking with some help from Ginger.

~https://en.wikipedia.org/wiki/List_of_Gilligan%27s_Island_characters

Of the entire cast - Mary Ann (Dawn Wells) recieved the most fan mail. In fact, she received twice as many fan letters as her co-star Tina Louise, who played Ginger.

Maryanne for sure. Big eyes, brown skin, and just the right amount of curvy!

It would have to be the Professor. The only good looking guy on the island, and he is smart.

OMG, Mary Ann for sure! I dirtied many a sock watching her during my adolescent mid-teen years. ;)