“According to one's own whims” in Japanese
Short answer
According to one's own whims in Japanese is “自由気儘” (jiyuukimama). Full meaning: free, unfettered, according to one's own whims, doing as one likes.
Other ways to say “According to one's own whims” in Japanese
自由三昧
jiyuuzanmai free, unfettered, according to one's own whims, doing as one likes
自由勝手
jiyuukatte free, unfettered, according to one's own whims, doing as one likes
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