There are 8 passives in the game, one for each player character and one for each type of enemy. Here are how they work.

The first passive is very simple. It just increases the current defence by 20 %. Very simple indeed.

The second passive attracts the fire of the enemy. It disables the target-able stats from every player that is in the sphere, so the enemy can only attack this specific player.

This passive decreases the enemies accuracy by 50% that is within the vicinity of this character. So this character is very difficult to hit.

This skill is a coin flip, whether they are target-able or not. So, there is always a chance for this character to not get hit at all, or just filled with lead.

This is a passive healing skill. Whoever is in the vicinity gains a little amount of health each phase. Very useful to keep this character with the main chunk of characters.

The mini boss passive. It completely counteracts the healing passive, always dealing damage to the player. The players must definitely not get too close to this character.

The minion passive. The more minions there are together, the stronger they become. It increases all the minions accuracy, defence and speed stat. Kill them quickly.

This is the boss passive. As he is getting shot and losing health, his defence decreases, but his accuracy and speed increase. So he starts becoming a glass cannon and destroy the player.