There could be characters like Frodo. Since the story is related to the Lord of the Rings universe, Frodo, who also has a connection with the One Ring, might be relevant. And perhaps Aragorn, as he is an important figure in Middle - earth and his actions could cross paths with Gollum's in some way.
In the Lord of the Rings Gollum game story, aside from Gollum, we might encounter Sam. Sam is Frodo's loyal friend and is often involved in the events related to the One Ring. Also, Gandalf could be considered. Gandalf is a powerful wizard who has his own part to play in the grand scheme of things in Middle - earth. His actions and knowledge could impact Gollum's story, whether directly or indirectly. There could also be some of the orcs and other evil creatures that Gollum has to deal with, which are also sort of characters in his story.
Well, besides Gollum in the Lord of the Rings Gollum game story, Sauron is an important figure. Sauron is the main antagonist in the overall Lord of the Rings saga, and his presence and the power of the One Ring which he created are central to Gollum's story. Then there are the Nazgûl. These are Sauron's powerful servants. Gollum may encounter them or be affected by their actions. Also, there could be other hobbits or inhabitants of Middle - earth like Merry and Pippin. Their adventures and the general state of Middle - earth during that time could be intertwined with Gollum's own journey in the game.
Chapter 431, "Su Yinwan Is Here Too?!", is the clearest early answer because it turns Is's situation into a concrete plot event. The chapter turns that into something concrete by moving from [Holy shit, why is Su Yinwan on this show too???] [!!! to Is the program team this cruel?.
Chapter 685, "Defense Value Skyrockets!", is the clearest early answer because it turns Shao Changqing's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The scene went live on Weibo right then.
Chapter 12 is the strongest chapter-level answer because it starts from Qin?" Jiang Li called out twice, and only then did Mrs. and follows through on The glass shattered on the floor with a crash, attracting the attention of....
Chapter 492, "Rewarding You with Some Wild Vegetables", is the clearest early answer because the buildup finally cashes out in a real clash.
Chapter 470, "Why Talk About Pigs When Looking at Him?", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with Wrapped in a bit of warmth, Jiang Yan slowly came to.
Chapter 633, "It's Time for Us to Attack!", is the clearest early answer because the buildup finally cashes out in a real clash.
Chapter 736, "When Will You Come to My House for Dinner?", is the clearest early answer because it turns Such's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Walking outside the tent, Zhao Lang waved his hand.
Chapter 742, "Brother Policeman, Look at Them!", is the clearest early answer because it turns Shu Yan'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 713, "Uncle Will Owe You for Life", is the clearest early answer because it turns Lili's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Li raised her head and was startled by Zhao Lang's smiling eyes.
Chapter 686, "Why Not Make Him Mute?", is the clearest early answer because it turns Luo Xingmu's situation into a concrete plot event. The chapter turns that into something concrete by moving from In the makeup room, Jiang Yan sneezed three times in a row.