The musician, real name Kirshnik Khari Ball, was killed in Houston on Tuesday.
Ja Rule, Kid Cudi, Khalid and Dave posted tributes on social media, while Rick Ross called him a young legend.
The shooting took place at about 02:30 local time on a balcony outside the 810 Billiards and Bowling Alley, where Takeoff had reportedly been playing dice with his uncle and bandmate, Quavo.
Police said two other people were injured and were driven to hospital in private vehicles.
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