From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Nail (ネイル, Neiru; FUNimation "Nail", Viz "Nail") is a Namekian.
 Appearance and Personality
Nail takes a very similar appearance to Piccolo. He dons a blue vest, red wristbands, and a white scarf around his neck. His chest and stomach are mostly exposed, he wears a blue belt (similar to that of Piccolo's) with white pants (also similar to Piccolo's, only a different color), and brown pointed boots (which are identical to Piccolo's and the other Namekians).
Nail takes on a very heroic, honorable persona. He dedicates his life to the protection of Guru, the Grand Elder of Namek. He cares deeply about his Namekian brothers, something he shows greatly during his battle with Frieza. Despite being the most powerful Namekian of his time, with a power level of 42,000 (making him comparable to the ranks of the Ginyu Force in power), he is easily brushed aside by the immense power of the galactic tyrant Frieza. Despite being completely outmatched, he continues to attack Frieza, only to suffer a brutal defeat. After fusing with Piccolo, his soul continues to reside within the ultimate Namekian warrior.
Nail was described as the lone "fighter class" Namekian left. He was the personal bodyguard to Grand Elder and was incredibly strong for a Namekian. In fact, he was the most powerful Namekian alive at the time of Freeza's attack on Planet Namek. He would later fuse with Piccolo, meaning he would continue to hold the title of the most powerful Namekian as he was part of Piccolo's immense strength.
While Son Gohan and Kuririn fought against Commander Ginyu, Nail had to battle against Frieza in order to stop him from killing Grand Elder and obtaining the Dragon Balls for himself. Despite Freeza being his lowest level of power at 530,000, Nail was no match for the tyrant, and even lost an arm (which he regenerated using Regeneration) during the battle. Before Freeza could finish Nail off, Nail revealed that this fight was to delay Frieza so Dende could get the Namekian Dragon Balls' password to the Earthlings. Enraged, Freeza immediately departs at full speed, leaving Nail to die on the ground.
Shortly afterward a newly resurrected Piccolo arrives and finds the disabled Namekian. Nail is still able to speak, Nail tells Piccolo that if Piccolo and Kami were one they would have beaten Frieza long ago. He asks Piccolo to fuse with him in order to increase his chances against Frieza, and at the same time save his life. Piccolo agrees after some questioning of Nail's motives, and indeed his power level increases dramatically to the point of being even with Frieza's second form or even stronger (since Frieza made the decision to transform immediately after Piccolo removed his heavily weighted clothing).
In the anime only, when Piccolo fought second form Freeza, Nail revealed himself (though Piccolo's voice) to Frieza. Later, when Dende was killed by Frieza in his final form, Nail (as Piccolo's thoughts) was shocked and saddened. After, everyone on Namek was brought back to life, transported to Earth, and Guru's second death, Dende finally realized that Nail had merged with Piccolo. Later, Nail was heard via Piccolo's telepathic thoughts when Dende returned to Earth as its new Guardian during Cell's reign. Nail is later seen in Piccolo's flashback to Dende describing Fusion during Majin Buu's reign.
 Video games
Nail made his video game debut in the 2007 game Budokai Tenkaichi 3 as a playable character. Although in the games Budokai, Budokai 2, Budokai 3, and Infinite World, Piccolo had an alternate costume which resembled Nail's attire. Nail is also set to appear in the upcoming game Dragon Ball: Raging Blast 2 which will be his first video game appearance in three years.
- Mystic Flasher – A yellow ki wave Nail uses to try and stop Freeza.
- Regeneration – The Namekian ability to regenerate a lost limb.
- Nobiru Ude – The Namekian ability to stretch one's limbs or make one's self bigger.
- Ki Blast
- Full Power Energy Wave – A Ki Blast of focused energy. Ranges in color.
- Super Explosive Wave – A wave of energy more powerful than the simple explosive wave. Ranges in color. Nail's version of the Super Explosive Wave looks very similar to Piccolo's Hyper Explosive Demon Wave.
- Ki Sense – The ability to sense ki energy. Nail is able to also sense if the energy is "good" or "evil".
- Fusion – The ability to integrate his own power into that of another Namekian.
 Battle power
 Voice actors
- Japanese dub: Katsuji Mori, Taiten Kusunoki (Dragon Ball Kai)
- Ocean Group dub: Michael Dobson
- FUNimation dub: Sean Schemmel
- Latin American dub: Ismael Larumbe Sr.
- Nail can be considered the third strongest Namekian in the manga canon (after Piccolo and Kamiccolo).
- If one looks closely, there are parts of Nail's clothing that were torn when fighting Frieza which aren't present when Piccolo arrives on the site of the battle in both the manga and anime, although Nail was clearly grieviously injured as before and had no time to recuperate.
- Nail's power level of 42,000 is 18,000 higher than even Vegeta's initial level of 24,000 on Namek, arguably enough to put him on par with some members of the Ginyu Force depending on perspective. His level is so high that Frieza is astonished at the reading, and even says to himself that he would have liked to have him join his forces if he could.