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1988 Kona Explosif - the pistachio with yellow spatter one. Only the frame and forks are original, naturally. With Magura HS33 Racelines for extra appeal....
I take it out on group rides occasionally, to give the youngsters a laugh. The laugh is often short-lived though - with modern tyres (tubeless, of course) and wider bars than bitd it’s still no slouch around typical moorland/plantation stuff.
up til a couple of years ago my only mountain bike was a 1995-ish Merlin XLM. On the right day on the right trail it was an absolute flying machine, but those situations started happening less and less, I started riding less and less and I sold it and bought an inbred as a forget-it-for-months-with-no-guilt MTB
92 Kona Lavadome (purple, natch). Very few replacement parts. Has done all sorts - raced it, ridden it in the Peaks and Lakes, single speeded it, commuted it, turned it into a utility bike. Will never part with it.
And for those who consider the 2000s retro, 2004 Cotic Soul. Hasn’t been ridden in years (due to road cycling and then no cycling since 2012). Won’t part with this one either.
Might be able to do some pottering soon if I get the ok, so either of these two will be ideal for the local towpaths.

1998 or 99 Lava Dome

2001 or 2002 Rock Lobster 853
Obviously they have different seats and bars these days
I still use my titanium Airborne Lucky Strike it’s the only mtb I have, so even though it’s getting on a bit I still have fun riding.
2002 Kona lava dome. Got some disc mounts brazed on and some 80mm SIDs
Rides lovely