I feel like Kwami and their holders act very similar. For example: Remember in Despair Bear when Adrien took Marinette's hand and pratctically yeeted her onto the dance floor?
Well, remember how in Sandboy, Plagg said something very similar to what Adrien said.
Also, when Tikki Plagg and Sass were standing in together, it was very similar to when Cat Noir Ladybug and Viperion were standing in the sewers in Desperada
Also Plagg calls Tikki Sugarcube, and Cat Noir Calls Ladybug Bugaboo Tikki Threatens Plagg, saying if he keeps calling her sugarcube she would call him a nickname, (stinky sock) Ladybug Also threatens Cat Noir, saying she will call him:
Bananoir Bugaboy
They are many more examples, but I'm going to end it there.
Whatcha think?