If you do not even have the slightest idea how a fighter class champion works. Do not pick leona.
From the last patches, I just get paired with a lot of leonas who have no clue what they are supposed to do. They just sit like a mile behind me like a mage support, and say "I can't engage. Jhin does damage"...Like evey adc does damage. They are all a "attack damage carry" ffs.
Then when they finally shoot out a lazy E. They are in a middle of a large minon wave and get aggro (and sometimes even get minion blocked and get 100-0ed) and die and get REALLY enraged at teammates.
After the game you see their profiles and...only play Sona. So I deduce they play like sona while playing as leona and expect to win...Like come on.