Light Yagami doesn't genuinely have a "crush" in Death Note. While he feigns affection for Misa Amane, he primarily sees her as a useful tool to further his goals as Kira.
Light's relationships throughout the series are largely manipulative and self-serving. He prioritizes his ambition to create a "new world" over genuine emotional connections. He views everyone, including his own family, as potential obstacles or resources.
Here's a breakdown of his relationships:
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Misa Amane: He pretends to love Misa to exploit her Shinigami Eyes and unwavering devotion. According to Tsugumi Ohba, the creator of Death Note, Light views Misa as a "bad person" and manipulates her constantly.
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Takada Kiyomi: He uses Takada for her position as a news anchor to spread his message and eliminate opponents. He discards her once she's no longer useful.
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His Family: He cares for his family to a certain extent, particularly his sister Sayu, but ultimately prioritizes his Kira activities above their well-being.
In conclusion, Light Yagami doesn't experience a genuine "crush" in the traditional sense. His interactions are driven by calculated manipulation and a desire to control those around him to achieve his ambitions as Kira. His relationship with Misa is the closest he gets, but it's based on exploitation, not affection.