I don't have JUS yet, but when I do, this is what I'm planning for my deck:
Kenshin 5-Koma: listed below in red
Luffy 7-Koma: listed below in white
Usopp 3-Koma: listed below in sienna
Allen 2-Koma (could be changed with Bo-bobo 2-Koma): listed below in black
Chopper 1-Koma (attached to Luffy): listed below in magenta
Piccolo 1-Koma (attached to Kenshin): listed below in green
Beauty 1-Koma (attached to Kenshin, could be changed with Kaoru (Rurouni Kenshin) 1-Koma): listed below in pink
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Note for Support and Help (information taken from Genroh's JUS guide on GameFAQs):
Usopp: 3 Koma: Laughter
Phoenix Star (Causes Burn effect)
Allen: 2 Koma: Knowledge
Cross Beam
Chopper: Status effect time is cut down
Piccolo: Health Recovers slowly
Beauty: Increase J-Soul (health) of Battle Character
Are there any suggestions for changes? I'd like to keep the same Battle Characters, and I want Sogeking to be in my deck even if he is bad, but I'd be fine with changing my Help Characters or Allen.