There are four musicians with the name Niku on:

(1) - Furry Brakecore/Mashcore artist from the united states, usually stylized as NiKU
(2) - Alternative/indle band with 4 members formed in 2019
(3) - Apparently a underground Hip-hop/Trap band/duo from somewhere
(4)- A three-person creator unit consisting of composer Chinozo, singer Kanane, and animator Gacha. (J-pop) Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.