Here's the combo popularity listing from a couple of months ago on what characters have been played over graveyard's span to help brainstorming:

Arial Warrior 601
Storm warrior 549
Fire warrior 529
Felar warrior 476
Human warrior 442
Dwarf Warrior 426
Cloud warrior 394
Duergar warrior 387
Svirf warrior 335
Elf warrior 249
Minotaur warrior 167
Dark-elf warrior 141
Half-Drow warrior 88
Gnome warrior 69
Half-elf warrior 41
Wood-elf warrior 39

Human thief 325
Arial thief 192
Svirf thief 104
Duergar thief 88
Felar thief 63
Half-drow thief 46
Dark-elf thief 37
Elf thief 32
Half-elf thief 21
Gnome thief 17

Duergar shaman 87
Human shaman 55
Storm giant 48
Dwarf shaman 39
Fire shaman 38
Half-drow shaman 30
Minotaur shaman 23
Arial shaman 22
Dark-elf shaman 19
Half-elf shaman 12

Elf healer 82
Human healer 77
Dark-elf 59
Gnome healer 44
Half-drow healer 39
Half-elf healer 31
Storm healer 24
Dwarf healer 21
Wood-elf healer 13
Svirf healer 10
Cloud healer 10
Arial healer 6

Wood-elf druid 66
Human druid 34
Gnome druid 27
Cloud druid 26
Half-drow druid 9
Half-elf druid 6
Arial druid 3

Human transmuter 325
Dark-elf transmuter 216
Elf transmuter 168
Gnome transmuter 142
Half-elf transmuter 71
Half-drow transmuter 63
Arial transmuter 35
Svirf transmuter 31

Human necromancer 239
Half-drow necromancer 56
Arial Necromancer 29
Dark-elf necromancer 21
Lich necromancer 10
Mummy necromancer 8
Half-elf necromancer 6

Arial invoker 149
Gnome invoker 120
Elf invoker 107
Human invoker 82
Half-drow invoker 78
Half-elf invoker 68
Dark-elf invoker 57
Svirf invoker 44

Felar ranger 437
Human ranger 265
Cloud ranger 173
Wood-elf ranger 166
Arial ranger 69
Elf ranger 65
Svirf ranger 58
Storm ranger 45
Fire ranger 43
Half-drow ranger 40
Half-elf ranger 30
Dark-elf ranger 23
Gnome ranger 10

Human bard 415
Elf bard 133
Wood-elf bard 131
Arial bard 80
Half-drow bard 69
Half-elf bard 48

Arial assassin 457
Human assassin 420
Felar assassin 336
Dark-elf assassin 132
Half-drow assassin 75
Half-elf assassin 38

Fire anti-paladin 233
Duergar anti-paladin 157
Human AP 123
Arial Anti-Paladin 77
Dark-elf anti-paladin 51
Felar anti-paladin 29
Half-drow anti-paladin 10
Half-elf anti-paladin 3

Storm paladin 166
Elf paladin 133
Human Paladin 106
Dwarf paladin 94
Half-elf Paladin 17
Half-drow paladin 7

Human conjurer 534
Elf conjurer 94
Half-elf conjurer 50
Half-drow conjurer 49
Gnome conjurer 27
Arial conjurer 22
Dark-elf conjurer 21
Svirf conjurer 12

Orc berserker 367

Human shapeshifter 802
Gnome shapeshifter 657
Half-drow shapeshifter 113
Half-elf shapeshifter 110
Felar shapeshifter 88
Elf shapeshifter 86
Svirf shapeshifter 52
Dark-elf shapeshifter 36
Arial shapeshifter 23