樂 is a single-character form of happiness or bliss that holds the ideas of laughing and having a good time.

This can also be translated as happy, glad, enjoyable, fun, and sometimes, music.

This a really good character if your audience is Chinese.

This is not a word seen alone very often in Korean.

In Japanese, this character is written like the image shown to the right. If you order this from the Japanese master calligrapher, it will look like this instead of the character shown above.
Note: In Japanese, this has a meaning of comfort, ease, and enjoyment.

See Also:  Joyfulness

愉 can be defined as pleasure, well-pleased, contented, and happy.

Note: 愉 is no longer in common use in Japanese.

See Also:  Passion

快 is the single character for “fast” in Chinese.

This applies to race cars, airplanes, rockets, etc.

This can also mean rapid, quick, speed, rate, soon, to make haste, clever, or sharp (of knives or wits). In some context it can mean cheerful or happy.

This is not a common choice for a wall scroll but if you're a speed freak, this may work for you.

Note: In Japanese, this usually has a meaning of pleasure, cheerful, delight, enjoyment, or the female given name Yoshi.

熱情 is a Chinese and Korean word for enthusiasm that can also be translated as passion (for a cause), ardency, ardor/ardour, enthusiasm, or zeal.

Enthusiasm is being warm, cheerful, happy, and full of spirit. It is doing something wholeheartedly and eagerly. When you are enthusiastic, you have a positive attitude.

In some contexts, this could mean being extremely fond of something or having a fondness for a cause or person.

This Chinese word can also be translated as "sincere and warm" or literally "warm sentiment / affection."

See Also:  Motivation | Passion | Commitment | Tenacity