I made up a combo list for Billy which I think pretty much covers most of his practical combos...
Mid-Screen Combos -
(0 Meter + 0 DC)
- cr.B, cr.B, cr.B, cr.B, f+A = 175 dmg
- cr.B, f+A, cr.B, f+A = 198 dmg
- j.D/cr.B, cr.B, cr.B/s.B, dp+B, hcf+C, qcf+C = 273/235 dmg
(0 meter + 1 DC)
- j.D, s.C *2 hits*, hcf+C, qcf+C, DC, dp+B, qcb+A = 315 dmg
(1 meter + 0 DC)
- cr.B, f+A, cr.B, hcf+AC, qcf+C = 284 dmg
- j.D/cr.B, cr.B, cr.B/s.B, dp+B, hcf+AC, qcf+C = 329/291 dmg
- j.D/cr.B, cr.B, cr.B/s.B, dp+BD, hcf+C, qcf+C = 337/299 dmg
- j.D/cr.B, cr.B, cr.B/s.B, dp+BD, f+B, qcb+A = 337/299 dmg
(1 meter + 1 DC)
- j.D, s.C *2 hits*, hcf+C, qcf+C, DC, dp+BD, f+B, qcb+A = 412 dmg
(2 Meters + 0 DC)
- j.D/cr.B, cr.B, cr.B/s.B, dp+BD, hcf+AC, qcf+C = 388/350 dmg
(2 Meters + 1 DC)
- j.D/cr.B, cr.B, cr.B/s.B, dp+BD, f+B, qcb+A, DC, qcb+AC = 403/365 dmg
Corner Combos -
(0 Meter + 0 DC)
- j.D, s.C *2 hits*, dp+D, dp+B, hcf+C, qcf+C = 353 dmg
(0 meter + 1 DC)
- j.D, s.C *2 hits*, dp+D, dp+B, hcf+C, qcf+C, DC, dp+B, cr.C = 386 dmg
- j.D/cr.B, cr.B, cr.B/s.B, dp+B, hcf+C, qcf+C, DC, dp+B, cr.C = 364/326 dmg
(1 Meter + 0 DC)
- j.D, s.C *2 hits*, dp+D, dp+B, DM = 401 dmg
- j.D/cr.B, cr.B, cr.B/s.B, dp+BD, f+B, dp+B, hcf+C, qcf+C = 399/361 dmg
(1 Meter + 1 DC)
- j.D, s.C *2 hits*, dp+D, dp+B, hcf+C, qcf+C, DC, dp+BD, f+B, dp+B, hcf+C, qcf+C = 445 dmg
- j.D/cr.B, cr.B, cr.B/s.B, dp+B, hcf+C, qcf+C, DC, dp+BD, f+B, dp+B, hcf+C, qcf+C = 442/404 dmg
(2 Meters + 0 DC)
- j.D, s.C *2 hits*, dp+D, dp+B, EX DM = 481 dmg
- j.D/cr.B, cr.B, cr.B/s.B, dp+B, EX DM = 449/411 dmg
(2 Meters + 1 DC)
- j.D, s.C *2 hits*, dp+D, dp+B, hcf+C, qcf+C, DC, dp+BD, f+B, dp+B, DM = 543 dmg
- j.D/cr.B, cr.B, cr.B/s.B, dp+BD, f+B, dp+B, hcf+C, qcf+C, DC, dp+BD, f+B, dp+B, hcf+C, qcf+C = 501/463 dmg
HD Combos -
Mid Screen -
(2 Meters)
- j.D, cr.C, b+A, HD, s.C *1 hit*, b+A, hcf+C, DC, Neomax = 639 dmg
(4 Meters)
- j.D, cr.C, b+A, HD, s.C *1 hit*, b+A, EX DM, DC, Neomax = 865 dmg
Corner -
(0 Meter)
- j.D, cr.C, b+A, HD, s.C *1 hit*, b+A, hcf+C, qcf+C, DC, qcb+C, (hcf+C, DC, qcb+C) x 4, *slight delay* dp+B, hcf+C, qcf+C = 633 dmg
(1 Meter)
- j.D, cr.C, b+A, HD, s.C *1 hit*, b+A, hcf+C, qcf+C, DC, qcb+C, (hcf+C, DC, qcb+C) x 3, hcf+C, qcf+C, DC, dp+BD, f+B, dp+B, hcf+C, qcf+C = 679 dmg
(2 Meters)
- j.D, cr.C, b+A, HD, s.C *1 hit*, b+A, hcf+C, qcf+C, DC, qcb+C, (hcf+C, DC, qcb+C) x 3, hcf+C, qcf+C, DC, Neomax = 842 dmg
(3 Meters)
- j.D, cr.C, b+A, HD, s.C *1 hit*, b+A, hcf+C, qcf+C, DC, qcb+C, (hcf+C, DC, qcb+C) x 2, hcf+C, DC, DM, DC, Neomax = 888 dmg
(4 Meters)
- j.D, cr.C, b+A, HD, s.C *1 hit*, b+A, hcf+C, qcf+C, DC, qcb+C, qcb+A, DC, qcb+AC, hcf+C, DC, qcb+C, hcf+C, DC, DM, DC, Neomax = 922 dmg
(5 Meters)
- j.D, cr.C, b+A, HD, s.C *1 hit*, b+A, hcf+C, qcf+C, DC, qcb+C, qcb+A, DC, qcb+AC, hcf+C, DC, qcb+C, hcf+C, DC, EX DM, DC, Neomax = 1026 dmg