Wear one's heart on one's sleeve

Meaning: 自分の気持ちを包み隠さず本音で話す、感情をあらわにする

For Example:

‣ I am a person that wears my heart on my sleeve because I don't like to hide who I am.

私はほんまの自分を隠すんは好かんけん、本音でしゃべるで。

‣ People who wear their heart on their sleeves are admirable.

自分に正直な人は立派です。

Synonym:

express oneself

honest