Amazon.co.jp: Audio Fan Mini USB Cable USB 2.0 L Shaped Mini USB (Male) to Straight USB-A Male, Mini B, L-Shaped C, USB Cable, Black, Approx. 9.8 ft (3.0 m) : Computers
Are Micro USB-B OTG cables/connectors 5-pin, 11-pin, or both? Wikipedia doesn't say anything about an 11 pin OTG connector, but Amazon seemingly has both 5 and 11 pin versions. - Quora
USB hardware - Wikipedia
USB Splitter or USB Hub? This Guide to Help You Choose One