Finding my main Champion

So I've been playing League of legends since season 4 and I believe it is time that I should settle down and find a main champion to play. I have played every role and enjoyed Top and Jungle the most. For Jungle I decided Volibear, Udyr, Vi, and Amumu are my go to junglers whenever I play solo or duo ranked. But for Top lane I'm completely stuck. I would like a champion that fits my playstyle and I can't decide on one to main. In lane early on I like to be pretty passive, farming under my turret and trading when I see an opportunity. I can farm extremely well in most circumstances like a melee in a ranged lane. But during teamfights I'm the complete opposite and like to be extremely aggressive and jump onto the enemy squishy and just destroy them. I also prefer tanky champions that can still do a lot of damage, and champions that have good early sustain. To give you an idea of what I play right now, I like Nasus, Malphite, and Pantheon. I just don't know if there is a better pick out there for me. A champion that can really synergize with my playstyle. If you could share champions that work with this I would really appreciate it. Thank you so much!