Eliza (Heavy Osiris Spiral or Dive of Horus)
Squigly (cHP or Drag n Bite)
Cerebella (Cerecopter or Heavy Lock n Load)
Almost anyone work, but in the order of Double/x, I really like these teams.
In the order of x/Double
Painwheel (cMP)
Fortune (HFiber, sHK, etc play around with this one.)
Parasoul (Pillar)
Valentine (cMK, Throw, etc etc)
Could go on, again, Double.. just works. Some of these work just fine as Double/x too. Double/Val with cMK is scary good!
And you have two of the best level 5 supers in the game..
Find someone else you just LIKE and I bet you can make them work with Double.
Bella, Parasoul, Fukua imo are notable characters for also not requiring doublejumps or air dashes in combos, if that's an appealing thing to you.
It was for me, I avoided adcs and stuff until I could do them, so I didn't play Val or Filia first.
Fukua and Double both can play effectively at similar ranges too, IMO, if that's a selling point, and Fukua is MAJOR EASY to pick up and can be played many ways.