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Leaving your bike exposed to the elements for extended periods of time can produced condensation in unseen areas of the bike. This can cause some problems with the eletricals if severe enough. My suggestion is get a cover to reduce damage from weathering. Get those gauges dried out and see what happens.
Even though the rust on the brake pads goes away after riding a little bit, the brake and rust dust are accumulating inside the caliper. If you have access to a air compressor, blow the brake dust out of the calipers and clean the rotors and calipers with some brake cleaner periodically. Depending on how you ride, your brake pads may glaze over and that may produce a squeal as well. However since you have very low miles on your bike, brakes issues may not be a factor unless you use the brakes excessively. Check them anyway just to rule them out.
The fact that the bike is making a noise at high speed (LOL, over 40mph) sounds like it might be normal engine sounds. If what you hear sounds like the video you referenced, it sounds like transmission whine, which is quite normal. The Ninja 250 has a transmission whine like no other bike and the quiet exhaust makes it even more noticeable. I'm willing to bet that if you get up to speeds above 50 mph, the wind noise will drown out everything. Just to be on the safe side also check your oil level.
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