As a result of Jarvan IV's K/D/A and utility, he has a pretty good overall win rate. He does best in the early game, with a winrate of 52.2% in that phase. Unfortunately, he does worst in the late game, where Jarvan IV's win rate is 47.9%., The difference between his best and worst game phases is about 4.3%. This large difference indicates that his power spikes and fades in different phases of the match. Plan accordingly.
Jarvan IV has been used somewhat often in recent ranked League games. In the current meta, his popularity is 5.8%. Hardly anyone sees him as a danger. He has only been banned in roughly 2.1% of League of Legends rounds.
You will see him most often laning in the jungle position. The top win rate position for Jarvan IV is jungle (51,1%). Currently, Jarvan IV's meta game is focused on tanking. Specifically, his gameplay should mostly be centered around protecting carries. Furthermore, he is a pretty good physical damage dealer champ. Dealing magical damage is the least important part of Jarvan IV’s playstyle.
You should anticipate having to dedicate a decent amount of time practicing and learning to get good with Jarvan IV. Most LoL players believe he is an average difficulty champion to master. Jarvan IV mostly does physical damage (86% of his total damage). He doesn't deal a lot of other damage types and should not be played as hybrid damage dealer..
Jarvan IV deals a good amount of damage during a regular ranked game (14.961 damage). You may want to focus on building him as a powerful champion to crush your enemies.
He is an average damage dealer on the Rift with 5.9 kills on average each game. That is one of the highest kill rates amongst all jungles. Furthermore, he has a relatively typical average champion death rate (5.5 deaths). Additionally, Jarvan IV has a high KDA ratio (3.2) with 11.5 assists.