In fanfiction, Tim Drake whimpering can be a powerful device for character development. It might be the starting point for his growth. For instance, he could start as a whimpering mess in a situation but then find the strength within himself to overcome it. This transformation can be very engaging for readers and make the fanfiction more interesting.
Sukuna does die in the manga. The way it happens is quite dramatic and ties in with many other elements of the story, adding depth and tension to the overall narrative.
One possible fanfiction could be about Tim Drake in a difficult situation, perhaps trapped or facing a great danger, which makes him whimper. This could show his vulnerability and human side that is not always seen when he's in his heroic role.
No. Ryomen Sukuna is a fictional character from Japanese mythology and modern manga/anime. He doesn't have a basis in a true historical event or person.
Nope. Ryomen Sukuna has no basis in reality. It's a product of the creative minds of the writers and illustrators who designed a captivating fictional character for the enjoyment of the audience.
One reason could be that it senses danger nearby. Arcanine has strong instincts. If there is a hidden threat like a sneaky and powerful enemy Pokemon approaching, it might whimper to alert its trainer or just because it's a bit afraid.