Bernardo

Bernardo is the handler for Beatrice one of the lesser seen cyborgs who was killed in a recent chapter of the manga. In the few scenes he is in, he appears to be an outgoing person in stark contrast to Beatrice's more stoic demeanor.

I thought it was about time we had a post for Bernardo especially give the action taking place in recent chapters of the manga.

That's right. First,someone has to post the page where these couple exist and we will going to add Bernado's characteristic.

This is Bernardo's wiki entry:

Bernardo
Bernardo (ベルナルド Berunardo?)
Voiced by: Yuto Nakano (Japanese), Duncan Brannan (English) in Gunslinger Girl: Il Teatrino
An agent of Section 2 and Beatrice's handler, whom he appears to be fond of despite her lack of emotion. Unlike his cyborg charge, Bernardo is shown in both the manga and anime as a gregarious and outgoing person.

A terrific Bernardo moment in both the manga and the anime is when the opera Tosca is being explained. Marco talks to Angelica about it, but stops short of telling her the tragic & bloody ending. Bernardo however has no problem telling Beatrice all about it, and even expounds a bit his opinions of violence & it's connection to the Italian national character.

How did Bernado react to Bea's death again?

That has not been stated yet. V11-12 seems to be a flash back series.