Question: Who was the brother of the title character in one of the Marvel Comics done by Esad T. Ribic?

Context articles: List of Ultimate Comics: The Ultimates story arcs
Ultimate Comics: The Ultimates
Fighting American
Namor
Symkaria
Marvel Comics Super Special
Marvel Premiere Classic
Captain America
Loki (comics)
Esad Ribić

"" is an ongoing monthly comic book series published by Marvel Comics that made its debut in September 2011 as part of the second re-launch of Ultimate Marvel.
 Through the 'Ultimate Universe Reborn' tagline following the "" and written by Jonathan Hickman with art by Esad Ribic, the series also serves as a continuation of elements from "Ultimate Comics: Fallout", and exists alongside other relaunched Ultimate Marvel titles including "" and "".
 The series continues the stories of the superhero team the Ultimates.
Ultimate Comics: The Ultimates is an ongoing monthly comic book series published by Marvel Comics that made its debut in September 2011 as part of the second re-launch of Ultimate Marvel.
 Through the "Ultimate Universe Reborn" tagline following the "" and written by Jonathan Hickman with art by Esad Ribic, the series also serves as a continuation of elements from "Ultimate Comics: Fallout", and exists alongside other relaunched Ultimate Marvel titles including "" and "".
 The series continues the adventures of the Ultimates, including Nick Fury, Thor and Iron Man.
Fighting American is the title character of a patriotically themed comic book character created in 1954 by the writer-artist team of Joe Simon and Jack Kirby.
 Published by the Crestwood Publications imprint Prize Comics, it was, contrary to standard industry practices of the time, creator-owned.
 Harvey Comics published one additional issue in 1966.
 One final inventoried tale was published in 1989, in a Marvel Comics hardcover collection of all the Fighting American stories.
 Subsequent publishers have had short runs of Fighting American stories with the permission of the owners' estates.
 The character gained some notoriety due to a lawsuit in the late 1990s when Awesome Entertainment founder Rob Liefeld announced intentions to publish a mini-series that was allegedly similar to that artist's run on Marvel's Captain America title.
 After settling the dispute, Awesome released three Fighting American series.
Namor the Sub-Mariner ( ) (Namor McKenzie) is a fictional character appearing in American comic books published by Marvel Comics.
 Debuting in early 1939, the character was created by writer-artist Bill Everett for Funnies Inc., one of the first "packagers" in the early days of comic books that supplied comics on demand to publishers looking to enter the new medium.
 Initially created for the unreleased comic "Motion Picture Funnies Weekly", the Sub-Mariner first appeared publicly in "Marvel Comics" #1 (cover-dated Oct. 1939) – the first comic book from Timely Comics, the 1930s–1940s predecessor of the company Marvel Comics.
 During that period, known to historians and fans as the Golden Age of Comic Books, the Sub-Mariner was one of Timely's top three characters, along with Captain America and the original Human Torch.
 Everett said the character's name was inspired by Samuel Taylor Coleridge's poem, "The Rime of the Ancient Mariner".
 Everett came up with "Namor" by writing down noble sounding names backwards and thought Roman/Namor looked the best.
Symkaria is a fictional Eastern European country appearing in American comic books published by Marvel Comics.
 The country was created by Tom DeFalco for the Marvel Universe.
 It is one of several fictional countries in Eastern Europe created for Marvel Comics.
 The fictional country is mostly known as being the home of Silver Sable and the Wild Pack team though it is used throughout the Marvel Universe.
 The country has appeared in issues of "Silver Sable", "Silver Sable and the Wild Pack", "The Amazing Spider-Man", "Thunderbolts", "Citizen V and the V-Battalion", and other comics published by Marvel Comics.
Marvel Comics Super Special was a 41-issue series of one-shot comic-magazines published by American company Marvel Comics from 1977 to 1986.
 They were cover-priced $1.50 to $2.50, while regular color comics were priced 30 cents to 60 cents, Beginning with issue #5, the series' title in its postal indicia was shortened to "Marvel Super Special".
 Covers featured the title or a variation, including "Marvel Super Special", "Marvel Super Special magazine", and "Marvel Weirdworld Super Special" in small type, accompanied by large logos of its respective features.
Marvel Premiere Classic is a line of hardcover comic book collections, compiling older Marvel Comics series in a standardized reprint format.
 One hundred and seven volumes have been released, starting in 2006.
 Each edition features two covers—the standard cover and a numbered "variant" cover for the comic book direct market, which are published in limited numbers and sport a matching trade dress design (the edition size is indicated on the back cover, on the dust jacket).
 These are similar to Marvel Comics' "Omnibus" editions, some of which are released with classic comic covers and variant covers painted by comics artists such as Alex Ross, Marko Djurdjevic, Esad Ribić, or Olivier Coipel.
Captain America is a fictional character appearing in American comic books published by Marvel Comics.
 Created by cartoonists Joe Simon and Jack Kirby, the character first appeared in "Captain America Comics" #1 (cover dated March 1941) from Timely Comics, a predecessor of Marvel Comics.
 Captain America was designed as a patriotic supersoldier who often fought the Axis powers of World War II and was Timely Comics' most popular character during the wartime period.
 The popularity of superheroes waned following the war and the "Captain America" comic book was discontinued in 1950, with a short-lived revival in 1953.
 Since Marvel Comics revived the character in 1964, Captain America has remained in publication.
Loki is a fictional character appearing in American comic books published by Marvel Comics.
 He is the adoptive brother and often the enemy of Thor.
 He is based on the being of the same name from Norse mythology.
 The character first appeared historically in "Venus" No. 6 (August 1949) and in modern-day in "Journey into Mystery" No. 85 (October 1962).
 The character was created by writer Stan Lee, scripter Larry Lieber, and penciller Jack Kirby.
 Though normally portrayed as a supervillain, he is sometimes depicted as an antihero.
Esad T. Ribić (born 10 November 1972) is a Croatian comic book artist, known for his work on various titles for Marvel Comics, including "Loki", "Silver Surfer: Requiem", "Sub-Mariner: The Depths" and the 2015 "Secret Wars".