Inquisitor Coteaz (C:IA)

If an enemy unit arrives from reserves within 12" of Coteaz and within his line of sight, Coteaz and his unit can immediately make an out-of-sequence shooting attack against it. There is no limit on how many times the ability can be used in a turn.

Coteaz allows you to re-roll the dice to Seize the Initiative, or force your opponent to re-roll his.

​If a Detachment includes Inquisitor Coteaz, all non-vehicle units in the same Detachment have the Objective Secured special rule. A unit with this special rule controls objectives even if an enemy scoring unit is within range of the objective marker, unless the enemy unit also has the Objective Secured special rule.

When a unit that contains at least one model with this special rule takes Morale checks or Pinning tests, they ignore any negative Leadership modifiers. If a unit is both Fearless and Stubborn, it uses the rules for Fearless instead.

Independent characters can join other units.  They cannot, however, join units that contain vehicles or Monstrous Creatures.  They can join other Independent Characters, though, to form a powerful multi-character unit!  Independent Characters pass Look Out, Sir rolls on a 2+. A unit that contains one or more Independent Characters does not need a double 1 to Regroup if reduced to below 25% of its starting numbres, but instead tests as if it had at least 25% remaining.

Full details in BRB. Rule too long to copy verbatim.