Question: Which character did they build the original series around?
About the article "Dexter (TV series)", section "Spin-off series".

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Raj did not appear in the original, unaired series pilot, where only Sheldon, Leonard, and a different version of the Penny character, called Katie, were present.
The test audiences reacted negatively to Katie, but they liked Sheldon and Leonard.
In the new pilot, Raj and Howard were added.
Series co-creator Bill Prady stated: "The idea was, if they like these first two guys, let’s give them two more".
Rajesh's social anxiety around women was inspired by a former co-worker of Prady.
Originally the character was called "Dave", and was an American born to Indian parents.
This was changed when Nayyar won the role, because he was "so Indian". 
A short pilot episode was produced, but never aired in full.
The full four-minute promo was released on Time Life's DVD set in 2008.
Scenes of the pilot can be seen in TV promos that aired prior to the beginning of the series.
Among differences seen in the promo pilot, the Ghostbusters wore the beige jumpsuits they had worn in the film instead of the color-coded jumpsuits they would wear in the finished series, and the character design for Peter Venkman bore more of a resemblance to actor Bill Murray than the character design seen in the finished series.
When he auditioned for the voice of Egon Spengler, Maurice LaMarche noted that while he was asked not to impersonate Harold Ramis, he did so anyway and eventually got the part.
LaMarche also noted that Bill Murray complained that Lorenzo Music's voice of Peter Venkman sounded more like Garfield (who was also voiced by Music at the time.)
A different explanation for the change of actor for Peter Venkman came from Dave Coulier, who took over the role of Venkman from Music, who explained that Joe Medjuck a producer on both the original 1984 film and the animated series, wanted the character to sound more like Bill Murray.
Ernie Hudson was the only actor from the films who auditioned to play his character in the series; however, the role was given to Arsenio Hall.
At the same time "The Real Ghostbusters" was being created, Filmation was making a cartoon known simply as ""Ghostbusters"", which was a revamp of Filmation's 1970s series "The Ghost Busters".
The character designs by Jim McDermott were dramatically redesigned from the way the same characters looked in the movie.
Although the "Ghostbusters" concept was tinkered with, the finalized show does feature many tie-ins from the films.
The Stay Puft Marshmallow Man made numerous appearances.
During the third season, Walter Peck, the Environmental Protection Agency antagonist from the original film, reappeared.
The uniforms and containment unit were redesigned, and Slimer was changed from a bad ghost to a resident and friend, events which are explained in the episode "Citizen Ghost" that flashes back to what happened to the Ghostbusters right after the movie's events.
Gozer is also mentioned repeatedly throughout the series, usually in comparison to a ghost they are currently battling (e.g.
"Cthulhu makes Gozer look like Little Mary Sunshine").
In the third season, some of the character designs were modified.
Ray's character design was slimmed down to give the character a less overweight appearance and Slimer was given a tail instead of the formerly rounded bottom.
The biggest change was to the character of Janine, whose hair was completely changed from being short and spiky to long and straight.
Her overall design was softened, as was her personality.
Her voice was also softened with Kath Soucie taking over the voice role from Laura Summer.
Changes to Janine's character were eventually addressed (and resolved) in the season 5 episode (#118) entitled, "Janine, You've Changed".
At the start of the series' third season in 1988, the series was retitled to "Slimer!
and the Real Ghostbusters".
The opening was completely redone to centre around Slimer.
Eventually the episodes were expanded from their original half-hour format to last an hour, and the overall feel of the show was changed to be more youthful, with episodes having a lighter tone to be less frightening.
When "Ghostbusters II" was released, the character of Louis Tully was introduced to the show, with his voice provided by Rodger Bumpass, and later episodes referenced events from the film.
At the start of Series Two Dave Coulier took over the role of voicing Peter from Lorenzo Music and at the start of Series Three Buster Jones replaced Arsenio Hall as the voice of Winston.
The show was canceled in 1991.
The only voice actors to remain for the entire series were Frank Welker and Maurice LaMarche. 
"Gilligan's Planet" is based on the premise that the Professor had managed to build an operational interplanetary spaceship to get the castaways of the original series off the island.
True to form of the castaways' perpetual bad luck, they rocketed off into space and crash-landed on an unknown planet that supported human life.
In many ways, the planet was like the island but with a strangely colored and cratered surface with more land to get around.
The rocket was severely damaged in the crash, thus the castaways were still stranded and the Professor resumed his attempts to repair their only way home.
Overall, "Gilligan's Planet" re-presented the source material of the original live-action series with "space" and "alien" themes.
Encounters with "headhunters" and other shipwrecked people became encounters with alien creatures.
A new character named Bumper was added, who appeared as a cute, reptilian alien pet/sidekick for Gilligan and company. 
Secondly, a new series can be created as a deliberate off-shoot from a parent series.
This can also occur in two ways.
One method was to take a supporting character from an existing series and start a new series with that character in the lead (sometimes with the lead character from the original series appearing in a cameo).
Two examples are Judge Anderson, first introduced in "Judge Dredd", being given her own series, "Anderson: Psi Division," five years later; and Durham Red getting her own series after her debut in "Strontium Dog".
Since "Judge Dredd" and "Strontium Dog" occupy the same universe, it follows that Anderson and Red do too (although they have never both appeared in the same story).
Another method was to create a brand new character for a new series, but to state from the outset that the story took place in an existing environment from an established strip.
Most of the series in the "Judge Dredd Megazine" were created in this way.
In "2000 AD" "The 86ers" was a series set in the world of "Rogue Trooper" which did not feature the established cast of its parent strip. 
Unlike the original series, which did limited location shooting in Texas but was filmed primarily in Los Angeles, principal photography for the new series takes place in and around Dallas.
The new series is also doing location shooting at the actual Southfork Ranch in the northern Dallas suburb of Parker.