Name: Kai Smith

Tier: Check this vid for Base form | 6-C (True Potential) | 6-C (Dragon Form) | 4-B (Staff of Elements) | High 6-C (Reverse Time Blade) 

Strenght: Check out this vid for Base form | Mountain Level [True Potential] (Should be comparable to Cole in TP, who was said to reach mountainous levels) | Star Level [Dragon Form] (Easly  injured Aspheera , who tanked an explosion from the 4 Golden weapons  (Aspheera got back up later) and tanked shots from all 6 Ninjas at base ) | Star Level [Staff of Elements] (Kai's strenght with  the Staff should be massively higher then his True Potential Form, as well as gaining the feats from every single elemental masters except Nya, Garmadon, Wu, Morro and the Time Twins) | City Level [Reverse Time Blade] (his strenght should be comparable to his base form strenght)

Durability: Check out this vid for Base form  | Star Level [True Potential] | Star Level [Dragon Form] | Large Star Level [Staff of Elements] ( Chen easly deflected a blast from LLoyd , those feats should apply to Kai too. The Staff of Element massively amplifiy the elemental powers feats) | Star Level [ Reverse Time Blade ] 

Speed: Check out this vid for Base form | FTL [True Potential] | FTL [Dragon Form] | FTL+ [Staff of Elements] ( Chen easly blitzed Lloyd , this feats should apply to Kai too) | FTL [Reverse Time Blade] 

AP:  Check out this vid for Base form | Star Level [True Potential] ( Kai one shotted the Ice Dragon who easly took out multiple villages. Kai also holded the Golden armor in Season 10) |  Star Level [Dragon Form] | Large Star level [Staff of Elements] (The staff boost the user attack potency) | Universal Level [Reverse Time Blade] (The Reversal Time blade was stated to be able to affect the entire universe)