Well, Spawn's demise in the comics can occur in various ways. It could be from facing overwhelming supernatural forces or being betrayed by allies. The circumstances vary depending on the comic arc.
It could mean that Naruto is the source or inspiration for a lot of fan - created fictional works. Fanfiction often takes existing characters and universes, like Naruto's, and spins new stories from them.
The ending of the Spawn comic book story is quite complex and depends on how you interpret it. Some might say it leaves room for further exploration, while others think it offers a definite conclusion.
The author may also describe the bat's sensory experiences. Bats rely a lot on echolocation. They emit high - frequency sounds and listen to the echoes to navigate and find prey. The story could go into detail about how this works from the bat's point of view. It could also mention how the bat perceives the world around it in terms of sound, touch, and smell, which is very different from how we humans perceive our world.
It could be that the bat is too solitary and doesn't know how to socialize, so it has no friends. Or perhaps it has a bad temper and scares others away.
One option is to check your local library. Sometimes they have a collection of comics, and you might get lucky and find Spawn there. Another possibility is to search on dedicated comic bookstores' websites. Some of them offer digital or physical copies for purchase or rental.