Answer:
I come without being fetched at night hides away as soon as daylight strikes. Although I may look small I am much mightier than what you can imagine.
I go in hard come out soft. Blow me hard and I’ll make a pop.
I am a celebrity fish.
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
I can be found after you remove 6 letters from BSAINXLEATNTEARS
I am owned by Old McDonald.