How does the fire introduce new character interactions in the Hunger Games?

Fire plays an important role in the hunger games.

Explanation:

Fire plays a huge role in both the Hunger Games and the entire trilogy.

We should not only see the fire because of Katniss who is "the girl on fire". There are more scenes where fire plays an important role that introduces new interactions with the characters. Let's see the cases:

When Rue and Katniss destroy the Careers' supplies, Rue lights 3 bonfires to confuse them and allow Katniss to destroy her things.

In The Hunger Games: Catching fire we have the girl from District 8 who lit a fire at night, which led to her death because she was discovered. Katniss used what was left of that fire to cook.

Here, too, the people in charge of the games, started a fire to gather the tributes in one place and thus fight.

The fire in Katniss and Peeta's suits also served to attract attention and get sponsors, as well as gain enemies.