I just discovered that Kenchi418, the author of X-Men OC story Extraordinary Times and DC OC story Less Than Zero, has a Naruto/BLEACH mixup he hasn't worked on in years, but which I binged anyway,
https://www.fanfiction.net/s/6701262/1/T...-Never-Die
After a very different resolution to Naruto's story, the now-immortal ninja brat wanders the Earth... until stumbling into the flood of yin chakra reiatsu unleashed by Ichigo and Uryu's Hollow-hunting competition. This leads to him joining the ryoka invasion, and not affecting its course much... but it turns out the butterflies were saving their strength for the Arrancar Arc. The daft bugger even found room for the Bount.
https://www.fanfiction.net/s/6701262/1/T...-Never-Die
After a very different resolution to Naruto's story, the now-immortal ninja brat wanders the Earth... until stumbling into the flood of yin chakra reiatsu unleashed by Ichigo and Uryu's Hollow-hunting competition. This leads to him joining the ryoka invasion, and not affecting its course much... but it turns out the butterflies were saving their strength for the Arrancar Arc. The daft bugger even found room for the Bount.