Android 15 is Dr. Gero's fifteenth android creation. He is designed to serve Gero's vendetta against Goku, who overthrew the Red Ribbon Army as a child.
While the main timeline version of him was destroyed by Gero, the parallel world version Android 15 makes his debut as an antagonist in Dragon Ball Z: Super Android 13!.
According to Akira Toriyama's art of the character, this android was intended to be Android 14 (人造人間14号 Jinzōningen Jū Yon-Gō, lit. "Artificial Human No. 14"), however, Toei Animation switched the two androids' names.
This dropdown contains the synopsis of Android 15’s story. Read at your own risk as you may be spoiled otherwise!
He was developed by Dr. Gero at some point before the Androids Saga. Along with Android 13 and Android 14, Android 15 was quite close to the final Android form, however like their predecessors they had one problem or another and as such were presumed to have been destroyed by Dr. Gero.
Even though Android 13, Android 14, and Android 15 are not featured in the Dragon Ball manga, the "Androids A-B-C's" section mentions that Androids 13, 14, and 15 were very close to the Android concept.
Android 15 is completed by Dr. Gero's self-aware supercomputer alongside Android 14. The two set out for West City, where they devastatingly assault a restaurant where Goku's family is in the midst of dining, in an effort to kill Goku. After rescuing bystanders in the restaurant's vicinity, a short battle between the Androids and Goku and Future Trunks ensues (the former deducing their connection to Dr. Gero and his androids from the prominently displayed Red Ribbon logo on Android 15 as well as the fact that he couldn't sense their energy earlier); the fighters soon after take their combat to an isolated glacial area, where they are followed by Gohan and Krillin.
While 15 and 14 are taking up arms against Goku and Trunks, a third android arrives on the scene: Android 13, who was completed by Dr. Gero's supercomputer after Androids 15 and 14. Upon his arrival on the scene, 13 confronts Goku, leaving Trunks and Vegeta to fight against 14 and 15 respectively. Ultimately, Android 15 is destroyed by Vegeta following Vegeta's transformation to Super Saiyan by decapitating him with a punch (in sync with the destruction of Android 14 by Super Saiyan Trunks), although not before dealing a heavy blow to the Saiyan Prince simultaneously, with the decapitation having a delayed effect. However, even their deaths are fail-safe, as 13 absorbs components from 15 and 14, resulting in his transformation into Super Android 13.
Intelligence:Genius Intelligence (An android created by Dr. Gero which means it's most likely outfitted with various different battle strategies and the ability to analyze their opponents and find out their weaknesses)
Energy Attack: The most basic form of energy attack used by androids.
3D Scan Mode: A mode that allows advanced scanning of enemies.
Goku Termination Program: Android 15 was programmed to kill Goku. The program contains information on Goku such as his address, fighting style, and techniques.
Android Barrier: Used to protect himself from Future Trunks' Continuous Energy Bullets.
Android Strike 15: Android 15's ultimate attack. Used on Vegeta in the movie and named in Raging Blast 2.
Energy Squall: An energy sphere barrage used by Android 14 and Android 15 against Future Trunks.
F.F. Spark Cannon: An energy sphere barrage used by Android 15 against Future Trunks.
Multi-step Ki Blast: An energy sphere used several times in the movie.
Murder Ball: A Full Power Energy Ball.
Combined Energy Ball: First, Androids 14 and 15 charge their own energy spheres, then they combine them into one unique and gigantic energy sphere, and fire it from below at the target. They used this attack against Goku and his family, destroying the building where the family was dining.
Other
Standard Tactics: Android 15 will shoot ki attacks along with use hand to hand combat, analyzing the data of his enemy during battle.
The speed scaling for PLs are taken with a grain of salt as there are noticeable times where someone's speed isn't equal to their power, such as Burter being faster then Recoome and Jeice, along with Super Saiyan Grade 3 Trunks having his power greatly increased but his speed decreased.
In the fight of Trunks vs. Mecha Frieza, who is far stronger than his final form, Mecha Frieza immediately goes for his strongest attack, the Supernova. In the original Z anime King Kai even states this is ten times stronger than the power he used on Namek:
Original DBZ Anime Version[160]. The attack is directly noted that it could destroy the planet, but doesn't because Trunks catches it, when Mecha Frieza proceeds to detonate it, the explosion is massive but the planet is still intact, implying Frieza must target the core in order to destroy the planet.
↑"What work do you do on the films, Sensei?
I check the plot and script that gets sent to me from Toei Animation. I also do some character designs and touch-ups, as well as altering the names and such."