Ice King and Finn the Human both had crushes on Princess Bubblegum. However, the nature and intensity of their affections differed significantly.
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Ice King: His obsession with Princess Bubblegum is a recurring theme throughout Adventure Time. However, this is an unhealthy obsession fueled by his madness and memories of Betty, not genuine affection. It is essentially a one-sided, often disruptive pursuit.
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Finn the Human: Finn harbored a genuine crush on Princess Bubblegum early in the series. He admired her intelligence, power, and leadership. This crush was a typical childhood infatuation, but the large age gap between them made a romantic relationship impossible. He eventually moved on to other romantic interests, notably Flame Princess.
In summary, both Ice King and Finn had crushes on Princess Bubblegum, but these affections were very different in nature and healthiness.