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.
It could be other elements from Japanese folklore. There are many supernatural beings and concepts in Japanese mythology that might have influenced his creation.
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.
According to the story, a good listener should show empathy. That means trying to understand the feelings of the speaker. If someone is sad while talking, you can give a sympathetic look or a gentle touch on the arm to show you care. Also, don't interrupt. Let the person finish their thoughts before you start to talk. This gives them the respect they deserve and also helps you to fully understand what they are trying to say.
The story might suggest that respect is a big part of being a good listener. Respect in terms of not cutting in and allowing the speaker to have their say completely. Also, having an open mind is important. Don't judge what the person is saying right away, but listen with an open heart and mind.