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.
The team will most likely be very concerned. Ryder would probably take charge immediately and start giving orders to the other pups on how to help Marshall.
Well, their relationship could make the team stronger. Since Chase and Skye are important members of the Paw Patrol, if they are in love, they might be more motivated to work well together on missions. For example, they would be more coordinated in rescuing people or dealing with emergencies. Their positive relationship could also set a good example for the other pups, showing that they can have strong friendships and even love within the team.
The other Paw Patrol members would be really excited. Ryder would be proud and would start planning how to train the new puppies. Marshall might be a bit clumsy but very affectionate, always trying to play with the puppies. Rubble would probably offer to build them some cool toys or little houses. Rocky would use his recycling skills to make useful things for the puppies. Zuma would be eager to teach them how to swim.
Ryder would be very responsible and would plan out a special training regime for the baby as it grows up. Marshall would be super excited and would often accidentally set off his water cannon in his eagerness to welcome the new pup. Rubble would use his construction skills to make a cute little den for the baby. Zuma would be eager to introduce the baby to the joys of the beach. Everest would be all smiles and would offer to take the baby on a gentle snow adventure when it's big enough. All in all, the other Paw Patrol members would welcome the baby with open arms and hearts.
The pups' reactions would be quite diverse. Chase, being the police pup, would try to keep everything in order and make sure Marshall is in a safe and comfortable place. Skye, with her kind heart, would offer lots of hugs and comfort. Rubble might use his digging skills to make a warm little den for Marshall to rest in. They would all show their care in different ways.
Perhaps in the fanfiction, Marshall gets very ill with an incurable disease. The other Paw Patrol members try their best to find a cure, but in the end, Marshall passes away, leaving the team heartbroken. This could show how they cope with his loss and still continue to help Adventure Bay without him.
Rubble would probably be really concerned. He's a good friend to Marshall and would try to cheer him up by offering him some of his favorite treats or by just sitting next to him and being there for him. Skye might fly around him, trying to make him laugh with her acrobatic stunts.
The other characters would be very concerned. They would immediately stop whatever they were doing and run to Marshall's side. For example, Skye would be flying over as fast as she could. They would all show different levels of worry and care depending on their personalities.
Yes, there are some hints of a special relationship between Marshall and Everest in Paw Patrol. They often work together and seem to have a great bond.
Yes, there are quite a few out there. You can find some on fanfiction websites. Some stories might focus on their adventures together and how their relationship develops over time, like them helping each other during rescue missions and slowly realizing their feelings for each other.