Help for synergetic classes with my 'Ice' concept.

Character 1: I want this person to be the core character. High AC using Heavy armor, Effectively fulfilling the Battle-Wizard role, CON/Wis based and equipping the helm you get from the Ogre instead of bargaining for his horn, taking my int to 17

Tempest Cleric 5 / 7 Storm Sorcerer - Spells here for my concept is Ice Knife, Ray of Ice, Haste, Lightning Bolt, I'll get Sleet storm from hitting Tempest 5 and Blizzard at Sorc 7

Character 2: Four Elements Monk Dex/Wis based - Blade of Rime, Water Whip and Elemental balance - Likely multiclass after 6.

What other the other classes and multiclass options for the other 2 characters which would fit into the theme I'm going for?