What if a Black Hole passed through an Irregular type galaxy? So, most of you all are probably (well, why wouldn't you be) familiar with The Magellanic Clouds, and hour they are Irregular type galaxies. You should also be aware that they both orbit the Milky Way, so they act sort of like moons to a planet. Since they (most likely) do not have a central Supermassive Black Hole, I wonder, out of all ridiculousness, what are the answer to these two questions?:

1) What would happen to the Small or Large Magellanic Clouds if a Black Hole (maybe 100 time bigger than the sun) passed though them?

2) What would happen if Sagittarius A* passed through either the Small or Large Magellanic clouds. If you are not aware of Sagittarius A*, it is the Supermassive Black Hole that lies at the center of the Milky Way.
Black holes (even SMBs) are actually very small objects on an astronomical scale and in practical terms probably very little would happen.

There would be some perturbations of stellar orbits within the formation they were in, but unless there was a fairly close approach  very little would happen and on the scale of the entire formation the changes would affect only a small number of objects and not the overall "shape".

To put this in perspective, Sag. A* has a mass of about 4,000,000 solar masses.  Sounds big (is big :-) ).

But the Large Magellanic Cloud has a mass of about 10,000,000,000 solar masses (or about 2500 time larger than Sag. A*).  The dominant gravitational field is still that associated with the LMC itself, not that of Sag A*.

I think a good analogy would be a bullet fired into a lake.  Sure, it can cut a path through one isolated region and cause disturbance close to that path, but the bulk of the lake will be undisturbed apart from a slight ripple.

The Small Magellanic Cloud is still a pretty large mass at about 6,500,000,000 solar masses, so still roughly 1,400 times more massive than Sag. A*.  Again, we're talking bullet in lake territory.