Definitely the best influencer would be the one and only Andreas Antonopoulos. Check out his YouTube channel[1]. Link below.
Though if the main reason you're looking for influencers is for you to decide on what ICOs to invest on based on your opinion, then that's definitely a bad idea. Want to invest in ICOs? Do your own research and then decide for yourself.
[1]
https://www.youtube.com/channel/UCJWCJCWOxBYSi5DhCieLOLQnot investing on any ICO's for now.. Still wanna learn everything about crypto.
Yeah, Andreas is truly a bitcoin advocate. The first video I watched was the Bitcoin for beginners! so helpful.