Another possible theme could be discovery. They could discover new things about themselves or their abilities while interacting with each other. Maybe Tundra has a hidden talent that Rocky helps bring out, or vice versa. And this discovery could lead to them becoming even better Paw Patrol members and closer friends.
A common theme is adventure. Since they are part of the Paw Patrol, many fanfictions have them going on exciting missions together. They might be saving a stranded animal or rescuing a friend from a dangerous situation.
Another plot could involve the Mighty Pups traveling to a parallel Adventure Bay where everything is the opposite. For example, the bad guys are the good guys and vice versa. They have to figure out how to set things right without causing more chaos. They might also find out that their counterparts in this parallel world have different and interesting powers that they can learn from.
Marshall is often a popular choice. His clumsy yet endearing nature can be played up in fanfiction, especially when he's using his Mighty Pups powers. He could be in a situation where his firefighting skills are put to the ultimate test and his friends have to rely on him.
One great place to find Paw Patrol Rocky x Zuma fanfiction is on fanfiction.net. There are various stories there that explore their friendship in different ways. Some might focus on them having an adventure together where they use their unique skills to overcome challenges, like Rocky's recycling know - how and Zuma's water - based abilities.
Well, you can try looking on fanfiction.net. There are often a variety of Paw Patrol fanfics there. Just search for 'Rocky x Tundra' and you might find some interesting stories.
One idea could be that Chase and Rocky team up to rescue a lost pet in Adventure Bay. They face various obstacles like a flooded area where Rocky uses his tools to build a makeshift raft and Chase uses his speed to navigate through rough waters.
For Chase, you could develop his character by showing his vulnerability. Maybe he has a fear of heights that he has to overcome when he and Rocky are on a mission in a tall building. Rocky can be there to support and encourage him, which would also develop their friendship.
The Paw Patrol team would initially go through a period of disbelief. Rocky might isolate himself as he tries to come to terms with Marshall's death. Zuma would be quieter than usual, missing his friend. Ryder would have to step up and be strong for the team, but inside he'd be deeply hurt. They would also likely hold a memorial service for Marshall, with each pup sharing their favorite memories of him. This would help them start to heal and find the strength to continue their important work in Adventure Bay.
In the Paw Patrol universe, a date could be really cute. For example, the pups might go on a picnic by the bay in Adventure Bay. They could share some pup - treats and enjoy the beautiful view. Skye and Chase could fly together on Skye's helicopter, having a fun time looking down at their friends playing on the beach.