Android 17 is an android created by Dr. Gero being Android 18's twin brother. He soon killed Dr. Gero fleeing off with Android 18 wrecking havoc across earth. Soon after the Android Saga, Android 17 is seen giving energy to Goku. In Dragon Ball Super he was recruited in to Universe 7's team to fight for their universe.
Powers and Stats
Tier: 4-C | 3-A, likely High 3-A
Name: Android 17
Origin: Dragon Ball
Classification: Human (Formerly), Android
Attack Potency: Star level (Comparable to Android 18 who fought evenly with Vegeta, soon defeating him) | Universe level, likely High Universe level (Kept up with Super Sayian Blue Goku. Goku even remarked that he didn't intend to go Super Saiyan Blue against 17, and that 17 was holding back)
Lifting Strength: Unknown
Striking Strength: Class XGJ | Universal, likely High Universal
Range: Melee Range, planetary with ki attacks (far stronger than saiyan saga vegeta)
Standard Equipment: None Notable
Intelligence: Very efficient in martial arts, as he is capable of defeating most of the Z-Fighters, having very intellectual martial arts prowess.
Weaknesses: Overconfident not a problem after Cell showed up.
Key: Dragon Ball Z | Dragon Ball Super