There's quite a lot to being a leader that leaks into other things than just Splatoon. This is participated into many things like Businesses, School and even the military. "
Leadership is the process of directing the behavior of others toward the accomplishment of some common objectives." First thing you'll need to understand is that not everyone shares the same motives towards a common goal. It's your job as a leader to hopefully bring these different people together who share the same goal, therefore will need to work together. You're someone people look up to, you inspire people and you keep your cool under stressful situations. Don't be too strict but also don't be too loose either. but now in the terms of splatoon and how I see it. You'll have to get ready to understand the style of your team mates and bring them all together. The more you play together the better sync you'll have with them, you'll gain an understanding of their gameplay and they'll understand yours. Don't underestimate your members either, but acknowledge the fact that each one has potential for certain situations. Of course showing empathy is a huge key factor too. We're mostly busy people so try to fit events with their schedule.
Being a leader you'll need to have a clear sight of your goal and spotlight it for your other squad members to see. You have to believe you can make a difference. And of course dedication is important too.
Resources,
Link 1 ,
link 2
I highly suggest you to check out those links I've provided. If you have any more questions feel free to message me. :o)