Kirby's been a favorite series since I was little. I learned about him in Smash Bros., then played Kirby 64, then backtracked and picked up Kirby's Dreamland. Good series. Great to relax with.
On the other hand, I only just finished up Magic Knight Rayearth. Lordy, but the second season took a hard left turn towards the depressing, didn't it? I enjoyed it, though.