Gandhi, my male domestic tan tabby master, 6.5 years old, has started
exhibiting aggressive behavior in general but especially at night time
and even more especially when my fiance, Jim, stays over.

"Aggressive" does not mean anything vicious like biting or attacking
or purposely scratching; he has a very sweet disposition, overall.
What he does is more like pouncing and jumping on the bed and doing
anything to get me to get up and lead him out of the room, which I do
so Jim can get some sleep.

Background: Gandhi was the 2nd cat brought into the household from the
shelter and was, for the last 6 years, the low cat on the totem pole -
submissive and quiet yet playful and cuddly. Buddha, also 6.5 years,
Bombay mix and the first-adopted, is the dominant male; both are
neutered.  Buddha was by far the more active cat until about 6 months
ago, when their roles seem to have reversed.

Now Gandhi seems to be asserting himself more and more, especially
when Jim is around.  Obviously, this seems like jealousy/insecurity.

My question is how to address this behavior.  I have tried relocating
him into another room (he scratches the door to be let out and then
Buddha joins him in the act), shoving him off the bed unceremoniously
(he pounces back a moment later), and ignoring him (he just takes this
as a signal to try harder!). All these techniques seem to work for
about 10 minutes, then he simply repeats whatever behavior got him in
trouble.  It looks to me like he's having fun and sees all of this as
"playtime!"

Any sage advice about what to do?  He is healthy and happy, eats and
drinks and poops normally, and does not need to see a vet ;-)