If Samurai is a Tank, they will have Gladiator (Provoke, Convalescence, Awareness, Savage Blade, Flash) and Marauder (Foresight, Skull Sunder, Bloodbath, Fracture, Mercy Stroke), just like the Dark Knight. Otherwise, if Samurai is a DPS, they will cross with Lancer (Invigorate, Blood for Blood, Keen Flurry and Feint) and Pugilist (Featherfoot, Second Wind, Internal Release, Haymaker, Mantra). THis is basin on how works on other classes.

The Red Mage sound like a support caster/melee balanced DPS, with some heal skills. In case it is DPS, cross class with Thaumaturge (Surecast, Swiftcast, Blizzard II) and COnjurer (Cure, Raise, Protect, Stoneskin, Aero, Cleric stance? (this is usless if he is a DPS, unless you use opposite, to heal isntead of attack)), Also, if it is a melle using Rapiers, then can get the Lancer or Pugilist cross class. Red mage is complicated, beacuse is mage and melee at the same time, but also, is considered as balance between White Mage and Black Mage.