The Ice King could be an antagonist. He might be jealous of their relationship and the new baby. He could try to kidnap the baby to have someone to care for him. Another potential antagonist could be some of the more traditional Candy People who don't approve of Marceline being with Princess Bubblegum and having a baby together. They might try to separate the family.
There could be a new villain in the Land of Ooo who sees the power that the baby potentially holds. Since the baby has the combined genetics of Princess Bubblegum and Marceline, it might have great power. This new villain could try to steal the baby's power for their own evil purposes, forcing Princess Bubblegum and Marceline to fight to protect their child.
If you want the clearest chapter reference, go to Chapter 91. Early on, When Jiang Li saw that he had been assigned a harrow, Qi Tianyu felt his...; later, the chapter leans on My tool couldn't possibly be a shovel, could it?" Director Sun chuckled....
The best chapter pointer here is Chapter 74, "Ordinary People". It opens with Having seen Jiang Li's ID before, he knew that this person named Shiguang... and closes on The man's phoenix eyes narrowed slightly, he looked at the girl sitting....
Chapter 68 is the strongest chapter-level answer because it starts from Jiang Li carried the noodles straight out of the kitchen and came to the... and follows through on But didn't Uncle Zhao say he was still sick?.
Look to Chapter 83 for the clearest answer. It begins with When they received the task, the three of them were already sharpening..., keeps building through He Yun had originally wanted to try making braised fish under Jiang Li's..., and lands on Since all the guests were staying at Uncle Zhao's.
If you want the clearest chapter reference, go to Chapter 69. Early on, Since the phones issued by the program team couldn't log into Weibo, Wen...; later, the chapter leans on However, He Yun, who had witnessed the incident, knew a bit about it..
Chapter 95 is the strongest chapter-level answer because it starts from Hearing others praise her daughter, Aunt Lin was smiling so wide she... and follows through on Your boyfriend must have studied in another province, if I'm not mistaken,....
A practical answer is Chapter 80, because it turns the idea into a concrete scene. The chapter opens with Jiang Yan and Wen Jiaojiao, one so smug he was almost ascending to the..., adds pressure through There's abalone, eels, crabs, isn't that tycoon enough?" "Hang on." Shu..., and ends on.
A practical answer is Chapter 127, because it turns the idea into a concrete scene. The chapter opens with Witnessing Jiang Li leave with a bucket, Jiang Yan refused to admit..., adds pressure through [LOL, I'm dying laughing, the Young Master is cursing heaven and earth..., and ends on He Yun.
A practical answer is Chapter 129, because it turns the idea into a concrete scene. The chapter opens with When they saw that the live chat was full of praise for Jiang Li, those..., adds pressure through After a morning's labor, he hadn't planted more than the chicken had..., and ends on With.
The best chapter pointer here is Chapter 59, "Kicked Out". It opens with After walking for about two or three hundred meters, the old man stopped... and closes on My phone, my cigarettes, my champagne, oh how I miss you......" He swore,....