She’s the Investor Guru for Online Creators

Li Jin, 31, began backing creators years ago. She has raised her own fund to invest in influencer-related start-ups.

Cody Ko, a YouTube star with 5.7 million subscribers, found himself in a pickle in May. Two different start-ups wanted to give him stock, and he was concerned that they were potentially competitive deals. So Mr. Ko called someone he trusted for advice: Li Jin. Ms. Jin, a venture capitalist, suggested that Mr. Ko, 30, be honest and upfront with the founders of both start-ups about the potential conflict of interest. He agreed and ended up pursuing just one of the deals.