For the "sonic" related to sound:
* 声波 (shēng bō): This literally translates to "sound wave" and is the most common way to say "sonic" in this context.
For "Sonic the Hedgehog":
* 索尼克 (Suǒ ní kè): This is the official Chinese name for the video game character, directly transliterated from the English.
For "sonic" as an adjective (like "sonic boom"):
* 音速 (yīn sù): This means "sound speed" and is often used in this context.
Other possibilities:
* 超音速 (chāo yīn sù): This means "supersonic" and is used when referring to something exceeding the speed of sound.
The best way to say "sonic" in Chinese will depend on the specific context and what you're trying to convey.