Quick Draw: Yes, Perdita can make a Quick Draw shot when someone is within melee, but her range is only 2 melee -- she still can't shoot out from melee with a ranged weapon, except by using Gunfighter.
Immune to Influence: Yes, Immune to Influence stops spells (and any other effect) that are resisted with Wp. Note that this doesn't include static Wp checks (like Harmless and Terrifying checks).
Pitiful: No, Terrifying models don't ignore Pitiful unless they have some other ability that says they do. (Lord Chompy Bits, for instance, has such an ability.)
Mass Override: Yes, Mass Override can affect Masters, including Ramos, Hoffman, Leveticus, and Collodi. I'm not sure if Perfect Machine can ignore it, but I think so.
Breach Psychosis and Irresistible: Breach Psychosis makes Ryle immune to Irresistible. Unless he is somehow within 12 inches of Pandora. EDIT: I AM WRONG ON THIS.