Massive damage output, low defense, good maneuverability, low HP.
Dark Uchigatana, Dark Sunset Staff, Blossom Kite shield, Binoculars
Whichever armor set you prefer, just keep weight below 50% for the best roll. Rings - Clear Bluestone Ring, Ring of Steel Protection (the best one you can get), Chloranthy Ring (the best one you can get, and the Old Sun Ring. Abyss Seal can be swapped out if you want to do more damage, but it takes HP with every cast.
Dark Orb, Dark Hail, Dark Fog, Affinity
When you invade, find your target, cast Affinity while a decent ways away, then move up and cast dark fog to keep them on their toes, lure them in close and bait them into attacking or rolling out of the way of your Affinity, then Dark Hail them to death.