Sejuani
Excellent tanking ability and providing frustrating effects for opponents are Sejuani’s strongest points in season 9. According to statistics from Metatft.com, this champion boasts a purchase rate of up to 40% (a very high figure) in season 9. This indicates that many Teamfight Tactics players want to include Sejuani in their lineup.

An interesting point about Sejuani’s skills is that this character also helps teammates deal additional damage to enemies whose attack speed is slowed. This ability can come from Sejuani’s own skill or the effects from the Freljord trait. Therefore, it’s no surprise that Sejuani has such a high purchase rate as mentioned above.
Shen
Shen’s strength in season 9 lies in his extremely powerful trait – system. Besides being an Ionia champion, Shen also possesses the Resilient trait with high tanking ability and energy regeneration from the Empowered trait. This helps Shen achieve a purchase rate of up to 37% (only behind Sejuani) at this time.

According to experts, Shen should be combined with Taric in the front line along with any Targon champion in the back line. It’s important to note that the effects of increased shield creation and healing also apply to Shen’s skills. Therefore, combining with Taric will make Shen an incredibly strong tank.
Jarvan IV
The Icon of Demacia possesses one of the most frustrating control skills in the current season 9. In addition to stunning enemies when using the skill, Jarvan IV also lightly knocks up opponents within the area afterwards. This is considered a very strong skill and helps Jarvan IV achieve a purchase rate of up to 31% (ranking after Sejuani and Shen).

Furthermore, Jarvan IV himself has a relatively strong trait – system that many players desire to possess. The 5 Demacia milestone proves to be very strong as it helps your team gain many defensive stats and 2 Light Equipment. Meanwhile, the Strategist system significantly increases the power of both the frontline tanks and the backline damage dealers.
Conclusion
With versatility in both skill sets and trait – system, Sejuani, Shen, and Jarvan IV are highly sought after in Teamfight Tactics season 9. They promise to be key champions to unlock victory for players in the current patch 13.12.