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Deidara was originally from Iwagakure, although he readily abandoned the village for the opportunity of using his "art" more frequently, as his village ridiculed him for it. Deidara became an assassin bomber for hire, not caring who he worked with as long as he could use his artwork.

Sometime after Orochimaru left Akatsuki, Deidara was located by Itachi Uchiha, Kisame Hoshigaki, and Sasori, who were under the orders of the leader, Pain, to recruit him. Deidara refused at first, resulting in Itachi challenging him, promising to leave him alone if Deidara won. Deidara willingly accepted Itachi's challenge, but was easily defeated by Itachi's Sharingan, and joined the Akatsuki. Deidara, having taken a huge blow to his ego, carried a murderous loathing for Itachi and other Uchiha for the rest of his life, although he was intelligent enough to recognize Itachi as a more powerful opponent. However, he did take steps during his time with Akatsuki to get revenge on Itachi, such as training to counter Genjutsu.
Trivia:
* Deidara ranked 3rd in one official character popularity poll shortly after his debut, one rank above Naruto. He also ranked higher than any other member of Akatsuki (though at the point that poll was taken, only about half of Akatsuki's members were formally introduced).
* According to Pain, Deidara's reason for fighting is "just because".
* Unknown to him, his second partner, Tobi, has the kekkei genkai he despised the most: the Sharingan.
* Deidara was apparently very curious as to what was behind Tobi's mask, as when they stopped to eat dango during the Three-Tails arc, he began to tense up when Tobi began to remove his mask to eat.
* According to the 3rd Databook:
o Deidara's registration number is IW-08721.
o Deidara has completed 82 official missions in total: 4 D-rank, 27 C-rank, 35 B-rank, 13 A-rank, 3 S-rank.
o Deidara's hobby is experimenting with explosions.
o Deidara's favorite food was bakudan, a pun on the actual food (boiled eggs in surimi) and the Japanese word meaning bombs.
o Deidara's least favorite food was mixed rice/pilaf.
* Tobi commented that Deidara would die from an explosion. Ironically, Deidara would later self-destruct, as a last ditch effort to kill Sasuke.
* He has captured the most Tailed Beasts on screen.
* Despite Iwagakure ridiculing his artistic values and defecting, Deidara has earned some respect from certain high-ranking villagers, as Kurotsuchi called him "Deidara-nii", and wished to fight the person who defeated him: Sasuke Uchiha. The Tsuchikage, Ōnoki, also seemed displeased that someone like Sasuke could defeat Deidara.
(Source:narutopedia)

great character. fully fleshed out, lots of little quirks and details that make him a great addition to the Narutoverse.

plus him and Tobi are awesome together ^v^

especially the bit where Tobi says that Deis art is a rip off of some little piggy bank. i think Dei really "blew" his cool there... yeah, sorry.

reminded me of the kakashi episode with his face XD

Wonder if they'll ever show Kakashi's face.....

i don't think so ;p secret forever XD

Deidara is amazing. smile I love watching him onscreen.

=_=''''