Remember how Treguard helped a team get past the Medusa.

Majida turns up very suddenly, but you certainly know why she's there; with Pickle they never do explain. I reckon that the win-free series 3 got those in charge worried that they'd made Knightmare too difficult, and so an extra helper was brought in. There should have been a better explanation for the sake of the story though.

Actually, in the end having Pickle there didn't make it any easier for the teams (apart from series 1 and 3, KM had an average of one winner per series, sometimes with an extra win right at the end), so it goes to show that the game never got too simple.

I think Pickle would've been good as a regular character in series 4 though.

As for the "where did Pickle come from" question, well there was a male elf and a female elf.

Both were very much in love with each other...

Treguard, however, claims she is a wood elf, so how she got to be the Dungeon is anyone's guess.

She stops Dungeoneers from entering the Elven realms, so maybe the exit they never took is a way out of the Dungeon...

What about Elita, was there ever any mention of other cavern elves?

Is Pickle in Foretress of Assassins?

Yes, he appears in the gamebook section to offer the dungeoneer items he's trading in Level 1, then you have to rescue him at the end of the quest.

I have never read any text explianing exactly why, yet as mentioned, it is fanfictional as to what actually happens.

Actually, I don't know, that's only a theory Unless it was recorded in one of the books (I only own a few) then I don't believe Pickle's origin story was ever recorded. Still, it remains an interesting topic to fanficcers!