In Comicvine are a few Bleach debatters that putting Ichigo around LS tp MFTL+ (No joke)
https://comicvine.gamespot.com/forums/battles-7/are-bleach-characters-lightspeed-2076019/
https://comicvine.gamespot.com/forums/gen-discussion-1/bleach-characters-speed-2108709/
https://comicvine.gamespot.com/forums/gen-discussion-1/bleach-speed-level-1867129/
Reasons why people think they are LS or higher is based on statements, scaling and stat multipler:
https://comicvine.gamespot.com/forums/gen-discussion-1/bleach-speed-of-light-feats-1759181/
They are probably around 10-20 more topics based on LS Bleach on vine, but you shouldn´t take that seriously, especially from people like Undre and SilentNightZ which putting Bleach on multi-galaxy/multiversal level and MFTL+.
Even Vsbattle has here alot mind cinema by putting Ichigo on
MFTL.
However, i could accept sub-relativistic to relativistic in Bleach, depended on the interpretation. Lightspeed in terms of reaction are more stretched. Everything above that is probably not accepted on most battle boards.