KanjiJLPT N4
Turn Into

turn into, become, get, grow, elapse, reach

Mnemonic

A huntsman who has killed ten thousand beasts notices his body starting to turn into something monstrous. With each kill, scales spread across his skin. After ten thousand kills the huntsman has completely turned into a dragon—his transformation is finally complete.
Additional thoughts
Picture the huntsman's tally hitting 10,000 as the final scale clicks into place, sealing his transformation. The huge number emphasizes the gradual, cumulative process of becoming something new.
Quick recall
A huntsman with ten thousand kills begins to turn into a dragon.

Details

The keyword for 成 is turn into. This kanji conveys the idea of becoming, completing, or bringing something to fruition. It encompasses the process of transformation or achievement, where something changes from one state into another or reaches its final, accomplished form. It is widely used to express success, formation, and the completion of a process or goal.
On'yomi
せい、じょう
Kun'yomi
な.る、な.す、-な.す