Maybe it means that the person depicted in the cartoon is most proficient at simply not doing anything, perhaps indicating a laid-back or lazy nature. This could be used for comedic effect or to make a statement about taking it easy.
It could suggest that the character in the cartoon finds relaxation or comfort in not being actively engaged in any particular task.
In a cartoon, 'doing nothing is the something I do best' might imply that the character doesn't have much ambition or drive and is content with being idle. It could also be a humorous way of saying they have no real skills or talents other than being able to do nothing well.
If you want the clearest chapter reference, go to Chapter 39. Early on, Qi Tianyu had been looking forward to watching Jiang Li's drama unfold.; later, the chapter leans on But to his surprise, Wen Jiaojiao, who seemed to possess some strength,....
Look to Chapter 43 for the clearest answer. It begins with The moment He Yun willingly sat next to Jiang Li and even took off his..., keeps building through Movie Emperor He, where's your aloof persona?" "Waaah, He Bao, Mommy..., and lands on Just as she turned her gaze away, the other party.
A practical answer is Chapter 39, because it turns the idea into a concrete scene. The chapter opens with Qi Tianyu had been looking forward to watching Jiang Li's drama unfold., adds pressure through It's not by some great master, I copied it myself., and ends on His original intention was just.
Chapter 856, "Hurry and Stop Work!", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jiang Li looked towards the source of the commotion.
Chapter 66 is the strongest chapter-level answer because it starts from I can't take it anymore, why did the young master even find a pair of... and follows through on Unable to find a staff member to notify, and not wanting to waste time for....
Chapter 916, "Not Biological?!", is the clearest early answer because it turns Jiang Mingchuan's situation into a concrete plot event. The setup is Bang," Hong Pei slammed the teacup onto the table., but the pressure keeps building through What do you mean your dad just twisted his foot?.
Chapter 23 is the strongest chapter-level answer because it starts from Although Jiang Li exerted very little strength, Jiang Yan instantly felt... and follows through on However, just as she buried herself in the study, pouring over mysticism....
Chapter 5 is the strongest chapter-level answer because it starts from Actually, when Manager Fang saw Jiang Li, he was somewhat surprised. and follows through on Recently, he did suspect that his wife was cheating on him, but due to the.... The payoff is that the chapter closes with "Fuck!
Chapter 48 is the strongest chapter-level answer because it starts from He Yun felt guilty for initially ignoring Jiang Li on purpose, and with... and follows through on Besides, everyone's phones will be replaced with special smartphones....