You can sneak attack with everything and the kitchen sink in the games, yes.
If you want to play a somewhat straight martial character you could make a Motherless Tiefling Instincual Warrior*, start with 18 STR and 17 WIS for an eventual 22 STR/18 WIS at 20. Take the Beast Totem rage powers, have someone buff you with Magic Fang, pick Limitless Rage and Mythic Charge, then have fun. Take a two handed weapon with a decent crit range like Falchion (18-20) or a monstrous crit multiplier like Scythe (x4).
Can add four levels of Fighter for the bonus feats and drop them into Improved Criticals and Cleave. Mutation Warrior works pretty well and will give you more stats. Take Archmage Armour and drink Mage Armour potions, that actually procss the effect (not sure about the latest patches, haven't read up or played in a while now). Have someone craft them and buy whatever you can find.
Technically I guess you could do the same with a (Primalist) Blood Rager, but Motherless Tieflings synergize better with Instinctual Warriors due to the WIS bonus.
The only downside to playing "plain" martial characters is that the best suited, ahm, Mythical Path is probably Trickster.
The primary reason for taking Dazzling Display on Camellia isn't using it, I think, it was bugged for a long time anway and just disappeared from the menu, it's unlocking Shatter Defenses. As such, if you bild her to use that, it's a good choice regardless.
One level of Thug turns any Shaken effect into Fear after four (?) turns. So that's all you really need. Intimidating Prowess, put skill points in persuade and make use of the hilarious amount of +5 to persuasion checks gear that's lying around like everywhere.
Consider making a summoning-focused Ember to hold the front lines until the fear effect takes. It's not like you need her to burn everything to a crisp in such cases.
*Technical explanation: Additional unarmed attacks, Initiative Bonus through wisdom, +2 STR, +2 WIS from the racial abilities. Better will saves than "regular" martial characters. Mythic Charge applies on Pounce attacks you get from Greater Beast Totem. Buff Magic Fang, quaff a potion, press rage and sic the guy at enemies. Pretty simple, all in all.