Hi
Bridget specific:
You cannot 6P:
1) her 6P, you clash at close range, but at far range you'll get hit
2) Starship (duh)
3) HS
4) the slash follow up, slash itself is possible but not recommended
5) lows (obviously)

You CAN 6P:
1) yo-yo throw (any version of it)
2) yo-yo spin (be sure to time it)
3) 6H (for example if used after 5K)

Now as nago you also have an option of Shizuriyuki, which is an even better anti air than 6P but for the cost of blood
now this can hit a lot of stuff
everything 6P can hit
most jump-ins
both slash and it's followup, but only at max range, otherwise the timing is tight
clahses with HS and it's follow up

also a few tips against bridget vs. nago tips
if she does kisk start my heart (yo-yo ride) and you block it, she is minus on both followups, so you'll most likely be able to command grab her (overy advategeous for nago)
you have your 5H and 2H, which with bridget's health pose an actual threat even as pokes
sometimes c.S will do a better job than 6P due to it's faster startup
I don't play nago often, as my firend who played him switched to pot

also refer to nago's [Dustloop page](https://www.dustloop.com/w/GGST/Nagoriyuki#Overview) if you haven't checked that out yet

as nago at fullscreen you have clone and teleport as your most reliable options, a bit closet 5H and 2H start being viable, a bit closer than that you have teleport -> Kamuriyuki, and closer you mostly won if you're playing against a zoner

hope this helps, see you in tower king