My personal favored build/class is largely thematic and headcanon-y in nature; its' built around a significant part of my main character's body: his dove wings!
His entire "technique" revolves around propelling himself around with his mighty pinions, delivering powerful physical-based attacks using the kinetic energy the resulting velocity imparts on him — it's much easier to cut something when the thing doing the cutting is moving very, very fast, on top of the person holding said cutting implement is also moving very, very fast.
In essence, though, it's a high-agility Critical Hit build.
Attributes:
4 to Strength/Agility
5 to Cunning
2 to Willpower
Powers:
At-Will: Sneak Attack (interpreted as winding up for a more powerful thrust), Duelist's Stance (interpreted as flapping backward to avoid the strike and get a little distance, then strongly forward for the Riposte!), or Equanimity for boosted Crit chance and damage.
Recharge 1: Cleave or Power Wave
Recharge 2: Usually either Group Heal, Shatter, or Kiaijutsu depending on what I need at the moment.
Encounter: Deadly Shadow or Smite Evil
Ultimate: Unbreakable or Assassinate
Gear:
Weaponry: The Swift Sword for the Crit and Accuracy bonus. The War Scythe can work too.
Head: Duelist's Hat for a little extra Evasion or the Witch's Hat to boost Spellpower.
Neck: Fox-Tail Charm for the strong resistances to several commonly used magic types or a Magatama to counter pesky Tease or Psychic attack spam.
Shoulders: Usually the Guard's Cloak for all-around resistances or the Seaweave Cloak for the Sunder immunity.
Chest: Royal Leathers for the good mix of armor, ward and evasion, but any high-evasion armor will do here.
Arms: Royal Gloves
Feet: Winged Sabatons for the Initiative boost.
Rings: 2x Lucky Strike rings boost the already high Evasion and Crit stats to even higher levels, and the extra EC never hurts either. The Rogue's Ring can replace one if my Threat becomes an issue.
Companions:
Kiyoko and Cait: The Floof Troop. They are a the perfect duo for taking advantage of the Twist the Knife perk with their many, many debuff-inflicting powers, allowing you to regularly dish out some truly stupid levels of damage. Kiyoko is best wife, fight me.
Arona and Brint/Brienne: The Swole Squad. You don't need to worry about being targeted too much with these two since their Threat levels are almost always going to be higher than yours, on top of some of their alternate outfits allowing them to inflict debuffs regularly, particularly Chieftain Arona or Ice Brint.