Things you need to know:
The Heroic Challenge Tiers
S Tier: (Overpowered or Excellent Characters)
A Tier: (Very Good Characters)
Crusher / Rubble Master
Shroomboom / Paramushroom Promotion
B Tier: (Good Skylanders)
Series 2 Cynder / Shadowdancer
C Tier: (average Skylanders)
Cynder / Nether Wielder
Gill Grunt / Water Weaver
D Tier: (Below Average Skylanders)
Gill Grunt / Harpooner
E Tier: (Bad or Terrible Skylanders)
A Tier: (Very Good Characters)
Crusher / Rubble Master
Shroomboom / Paramushroom Promotion
B Tier: (Good Skylanders)
Series 2 Cynder / Shadowdancer
C Tier: (average Skylanders)
Cynder / Nether Wielder
Gill Grunt / Water Weaver
D Tier: (Below Average Skylanders)
Gill Grunt / Harpooner
E Tier: (Bad or Terrible Skylanders)