One common theme could be friendship. Since they are both characters, fans might write about how ice bear and panda support each other through various situations.
Well, you can try looking on some popular fanfiction websites like Archive of Our Own. Just search for 'ice bear x panda' there and you might find a good number of stories written by fans. Some could be about their adventures together in a fictional world.
A third plot could be that they enter a cooking competition. Ice Bear is very focused on winning, but Panda gets nervous. They have different ideas on what to cook. Ice Bear wants to make a sophisticated and traditional dish, while Panda wants to create something fun and new. They argue at first but then find a way to combine their ideas and create a winning entry.
Ice Bear is calm and reserved, while Panda is more outgoing. In a story, this can be shown when they attend a party. Panda is excited and wants to dance and meet new people, but Ice Bear is more content to sit in a corner and observe. Their different reactions can lead to some humorous situations, like when Panda tries to drag Ice Bear onto the dance floor.
One possible plot could be that Ice Bear and Grizzly get lost in the forest together. They have to rely on each other's skills. Ice Bear's calmness and survival skills, like building a shelter, and Grizzly's more outgoing and social nature helps them find their way back by asking other animals for directions.
Well, Ice Bear and Grizzly are the stars. Ice Bear, with his cold exterior but warm heart, and Grizzly, full of enthusiasm and big ideas. In the fanfic, their relationship could be explored, like how they handle disagreements or support each other in various situations.
They could both develop a deeper bond of friendship. Through shared experiences like helping out at a local animal shelter or solving a mystery in their neighborhood, they would trust each other more. This would lead to them being more comfortable around each other and being able to communicate without words in some situations.
I'm not sure if there is a widely - known 'famous' bear - panda love story in real life. But in fictional tales, we can imagine such a story. Maybe in a children's book, a bear and a panda from different parts of the forest meet and fall in love. They overcome the differences between their species, like their different diets, and live a happy life together.