Champions worth learning in each role.

Right now I am unranked and I plan to stay that way until I feel comfortable on a few champions in each role. Right now I have found myself comfortable when I play Nidalee, Heimerdinger, and Janna. I want to expand my pool and some of the champions I have found that I like would be for top; Fiora , Kled , Cassiopeia . For jungle I enjoy counter jungling so I think that Ivern would be fun. I already enjoy play Nidalee , and I think that I would want to learn Kayn too. I like roaming in Mid quite a bit so I think I would enjoy Kassadin or Talon. From some of my higher elo friends the said that it would be fine to have a immobile mid that I enjoy playing too such as Heimerdinger . For ADC I have a friend who is currently unranked himself who enjoys playing support so I am planning on getting Xayah for that pair. I also think it would be worth spending some time learning Kalista or Jhin. As I said earlier I already feel comfortable on Janna for the support role. I think Blitzcrank and Zyra would also be some supports that I would enjoy and find worth spending time on.

Overall are these all champions that I think are worth spending time on. Give it your honest opinion and if you find one that is not worth learning in anyway shape or form please tell me a champion that is similar that is worth learning. Thank you in advance.