Here is the start of Missions for Season 16 Part 1. Feel free to drop your suggestions and hints in the comments.
Season Missions (10/23/25)
Total: 12 Missions
4 starred
General
Stun 20 opponents (Lv5)
Location
Perform 16 aerial stunts (The Incredible Showdown)
Class
Dash into opponents 2 times in 1 race (Brawler, Lv10) 6x
Character
Slide on grind pipes for 24 s (Violet)
Franchise
Use 22 charged skills (Beauty and the Beast, Lv10)
Winnie the Pooh
★ Stay in slipstream for 50 s (Winnie the Pooh, Lv10)
★ Stay in the air for 20 s (Winnie, Lv10)
RANKED
Use 20 backward skills (Ranked MP, Lv10)
★ Activate 3 manual boosts in 1 race (Winnie the Pooh, Ranked MP) 6x
Diamond Pass
Win 8 races (Ranked MP, Diamond Pass)
Finish 12 races (Lv10, Diamond Pass)
★ Use 20 charged skills (Winnie, Diamond Pass)
) coming up most frequently. He also counts for the Complete Races as Trickster mission.