as i have remember, saiyans can kill one whole planet in a single fire, remember Vegeta fire up a whole planet whenever he went, it same as with Goku, but SSJ3 is different, he can eat up half of universe even not using the spirit ball, he can use so his power is at overmaxxed...

anyways Ichigo's power maybe compared to Yoh Asakura's oversoul power (from Shaman King), but Yoh is out of the question

and remember that goku can instant transmission if he takes out his breath..

I think gon (from hunterxhunter) should enter in this 4 hero battle