Prince Eric could be a main character. He would be important as he is Ariel's love interest. Also, King Triton, Ariel's father, could play a significant role as he would be concerned about Ursula's return and want to protect his daughter and the kingdom.
Flounder and Sebastian would likely be main characters. Flounder is Ariel's loyal friend and would be by her side through the new challenges. Sebastian, with his wisdom and musical talents, could try to use his charm to outwit Ursula. Additionally, Scuttle the seagull might be involved. He could bring some comical relief while also helping Ariel in his own clumsy way.
There could be a new character, a powerful mermaid or sea wizard who has knowledge about Ursula's resurrection. This character could either be an ally or an enemy. If an ally, they could help Ariel understand the dark magic that brought Ursula back and teach her how to combat it. If an enemy, they could be working with Ursula, or have their own plans that involve using Ursula and Ariel for their own gain.
Chapter 689, "Is the Soundproofing of This Private Room So Good?", is the clearest early answer because it turns Soundproofing's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jiang Li found the restaurant Shang Shaobai had mentioned, and had Ji...
Chapter 345, "Audition: She Couldn't Have Gotten in Through Backdoor Connections, Could She?", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with Jiang Yan managed to blurt out a whole barrage of words without any...
If you want the clearest chapter reference, go to Chapter 1. Early on, Jiang Li, I'm warning you, don't set your sights on Yinwan anymore, or...; later, the chapter leans on Following a bout of tinnitus, she struggled to open her eyes and finally....
Chapter 739, "Not Paying Debts, Shameless!", is the clearest early answer because it turns Fang's situation into a concrete plot event. Early on, Shu Yan isn't that ill, it's just a common cold, no, no need to go to.... By the end, Let me tell you, Shu Yan owes me money!.
Chapter 932, "Gu Pansheng [Extra · Main Character Chapter]", is the clearest early answer because it turns Mom's situation into a concrete plot event. Early on, Gu as in 'Gu Pansheng,' Pan as in 'Gu Pansheng.' I am four years old....
Chapter 440, "You Know Fengshui Array?!", is the clearest early answer because it turns Team's situation into a concrete plot event. It opens with The scorching afternoon sun, wrapped with moist sea breeze, ascended... and closes on They wanted to eat meat too!.
Chapter 704, "Even if I were a slave, I would be willing!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. It opens with Wu Daoshan looked at Zhao Lang in shock. and closes on President Sun wiped the sweat from his forehead as he watched the two....
Chapter 742, "Brother Policeman, Look at Them!", is the clearest early answer because it turns Fang Kai's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Fang Kai became panicked as things were not developing in his favor.
Chapter 388, "All the Rich People in Jing City Are in Jiang Li's Live Room", is the clearest early answer because it pushes Gu Yu into a new phase or setting. A useful checkpoint is the way the scene starts with what, what do you plan to do?" Gu Yu's false identity was never meant...
Chapter 779, "Unmarried but Have a Daughter?!", is the clearest early answer because it turns Daughter's situation into a concrete plot event.