[3] He took victory at the first race at Imola after a late lunge on Lance Stroll and finished fifth in the rookie standings and tenth overall.

In August 2016, Kari was also announced to take part in the GP3 rounds at Spa-Francorchamps with Koiranen GP, in place of Ralph Boschung.

For the rebranded 2019 F3 season, Kari would drive for Trident, and he would achieve two podiums, both 3rd place finished, in Barcelona and Sochi.

Kari was promoted to FIA Formula 2 Championship with MP Motorsport for the last two weekends of the 2018 season replacing Ralph Boschung.

In December 2015, Kari, along with his Motopark teammate Sérgio Sette Câmara, became a member of the Red Bull Junior Team and thus becoming a test driver of Scuderia Toro Rosso.

In 2022, following a year out of racing, Kari joined Jenzer Motorsport in FIA Formula 3, partnering Ido Cohen and fellow Finn William Alatalo for the opening Bahrain round.