Does Gabi shoot Eren in the manga?

Yes, Gabi did shoot Eren in the manga.

Yes, Gabi does kill Eren in the manga.

I'm not sure. You'd have to keep reading to find out.

Gabi remains alive in the manga. The plot doesn't lead to her death. It's one of those character arcs where she continues on despite facing various challenges.

Yes, Gabi does die in the AOT manga.

Gabi is still alive in the AOT manga. Her fate was determined by the plot and the author's choices, and death wasn't one of them for her in this particular storyline.

In the Attack on Titan manga, Gabi remains alive. Her character continues to play a role and faces various challenges but doesn't meet her demise.

Mikasa loves Eren without a doubt. This is evident in various scenes and her constant concern and protectiveness towards him. It's a key aspect of their relationship in the manga.

Yes, he does. His death is a significant plot point in the manga.

No, Eren doesn't marry Historia in the manga.