Your MOST favourite....

Buffy season 5

MF artist

Nicolai Grigorescu

MF snake

Plisskin

MF John Carpenter movie

Escape from New York. (Given your Plissken answer, now I can’t think of anything but.)
Most favorite Saturday morning cartoon you watched as a child?

Buster Brown, with Froggy the Gremlin. When I was that age, they were on the radio.

MF string instrument

Lute
Most favorite piece of music by Bach.

“Toccata and Fugue in D Minor.” A friend of mine was an extremely accomplished church organist, and I well remember him blasting this one out one Sunday when I was a guest at the church where he played organ. (He gave me a heads-up that he would play it, and if I wanted to hear him play it, then I had better be at church that Sunday.) Incredible that Bach could write such–and even more incredible that my buddy could play it flawlessly on a church organ. But he did. It was amazing.
Most favorite piece of music by Mozart?

Can I say The Marriage of Figaro? or does that not count as one piece of music? If not, I’ll say the Overture to The Marriage of Figaro, because I know The Marriage of Figaro is coming.
MF piece by PDQ Bach.

1712 Overture (although since you mention The Marriage of Figaro, maybe I should pick The Abduction of Figaro)

MF kitchen gadget

The George Foreman Grill

MF work by Beethoven

Tough call. The Ninth Symphony is hard to beat, though.

Most favorite romantic destination.

A little B&B in rural Vermont.

Prominently featured in the James Caan movie Rollerball, as you probably know: https://www.youtube.com/watch?v=qu1cDksmwKs

MF dystopic movie?

Blade Runner

MF biome

Tropical forest, for sure

MF Non-Indo European language

.werbeH

MF conspiracy theory.

My dad was fond of the belief that FDR arranged for Japan to bomb Pearl Harbor to draw the US into WWII.

MF chick flick

Bridesmaids

MF recording artist(s) of the 1960s

Jimi Hendrix. John Coltrane a close second.

MF British-born guitarist

Ritchie Blackmore

MF American-born guiarist

Warren Haynes

MF non-US drummer