All of the characters in both games fall short of
sorry
>a nuclear bomb that goes off decades after it's been dropped
In order to get a nuclear explosion, you need to combine two pieces of enriched uranium of subcritical mass into one block of supercritical mass. The problem is that when one piece starts approaching the other one, they start heating up A LOT, because they start exchanging neutrons and it accelerates the reaction of depletion, which is accompanied by a massive energy release. You approach those pieces a little more, and they become red-hot, then white-hot, then they start melting. As they continue to approach each other, melted uranium will start evaporating (4200 degrees C).
So it's impossible to bring those two pieces together, they'll melt and destroy any mechanism holding them, then they'll fly away from each other and cool off. So to actually combine them, you need to send the two pieces flying towards each other with such a speed that would supersede neutron flux density, which is at least 2.5 km/s. Then they'll hit each other before heating up too much, and produce an energy release that would give you a nuclear mushroom. Such speeds can't be achieved with any gunpowder firing mechanism, you need to use explosives, but it's still not that simple. You need a "slow" explosion, and a "fast" explosion. The first one will propel the uranium at a certain "slow" speed, and the second one will accelerate it even further, because if you give it 2.5 km/s speed with one push, it will shatter the uranium.
So you also need to detonate everything with an extreme precision (0.000001 second), which means the electronic components need to be in a flawless state, and there has to be a thermoregulator.
The explosives themselves need to be changed every other 5-10 years or they won't go off properly.
The uranium elements need to be changed every 15 years or so, or they'll degrade to the point of not being able to explode.
And there are some short-lived components with fissile material, that need to be changed quite often.
Needless to say, that bomb couldn't go off just as an idle piece of rock lying next to it couldn't do it.
So that piece of writing is stupid. But whatever. Let's examine this:
>a chick who loves looking like a walking piece of shit
Now that's just fucking retarded.