I also want to address the fact that Pokefan is still a good player to keep your eye on. I got my "stingray main" build from her and still works fairly well, though recently after watching one of Power's streams I'm looking into more aggressive play with unscoped firefin and a second build for splat charger to be more aggressive. My favorite streamer is Pika_3k who is also a charger main who plays
all chargers including the E-Liters. He's not very popular and seeing as team Neptune is on hiatus he's in a sort of weird spot in the competitive scene. As for specific teams, I don't really super closely follow specific teams but I do follow the players and the team accounts on twitter and keep up with what's going on in scrims (mostly watching fuzzy and HXN scrim on twitch) and other thoughts they have. I do follow StDx and TOMO a bit more than the others like Team Upgrade, Vitamin Sea, Deep Blues, Saikai, Quantum, Komodo, Prophecy and a few other free agents. As for teams outside of NA, I'd go to Ethereal and Kraken Paradise for EU and Yeah Nah for AU/NZ. I don't pay attention to the japanese scene other than knowing about good players like Dynamon and Atobaru.
If you care to, click
here for my twitter and click on following to see every person/team I follow.