Here is where I will be posting up the summaries of the character discussions, listing the Difficulty Ratings of each match-up, and combining all the posts and discussions into one easy-to-find place.  New character discussions threads will open every Monday, starting tomorrow.

Week #0: Meta Knight (40-60)
Week #1: Lucario (40-60)
Week #2: Marth (40-60)
Week #3: Olimar (40-60)
Week #4: Snake (40-60)
Week #5: Ice Climbers (30-70)
Week #6: R.O.B.  (45-55)
Week #7: Donkey Kong (40-60)
Week #8: Dedede (45-55)
Week #9: Wario (50-50)
Week 10: Falco  (40-60)
Week 11: Fox
Week 12: Pikachu
Week 13: Peach
Week 14: ...

Match-up Key
Advantage (60-40) or (70-30)
Neutral (50-50) to (45-55) 
Disadvantage (40-60) or (30-70) 

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Counterpick the Right Stages! 

There's an informative thread on which stages to counterpick or ban against characters and goes hand in hand with this thread. Take a look at it right here:

Kirby Character Counterpick