The best way to wish your Leo friend a happy birthday in English is to express your admiration and appreciation for their unique qualities and traits that make them a shining star in your life.

Leo is the fifth sign of the zodiac, ruled by the Sun, which represents pride, passion, creativity, and leadership. Leos are known for their bold and confident personality, their generosity and loyalty to their friends and family, and their desire to be in the center of attention.

To wish your Leo friend a happy birthday, you can start with a sincere and personalized greeting, such as "Dear [name], I hope this birthday brings you all the love and joy you deserve, because you are one of a kind." You can also use a bit of humor and flair to capture their attention and boost their ego, such as "Happy birthday, your majesty! May your kingdom continue to thrive and sparkle."

Next, you can highlight some of the unique traits and talents that make your Leo friend stand out from the crowd, such as their creativity, passion for life, and positive attitude. For example, you can say "You are such an amazing artist/performer/writer/entrepreneur (insert their favorite hobby or profession), and I am in awe of your talent and dedication. Keep shining, Leo!"

Another way to make your Leo friend feel special on their birthday is to acknowledge their generosity and loyalty to their friends and family. You can say "Thank you for being such a loving and supportive friend/sibling/partner/parent, and for always going the extra mile to make us feel valued and appreciated. We are lucky to have you in our lives, Leo."

Lastly, you can offer some heartfelt wishes and blessings for their future, such as "May this new year of your life be filled with even more adventures, success, and happiness, and may you continue to inspire and uplift others with your kindness and charisma. Happy birthday, Leo, and cheers to many more!"

In conclusion, wishing your Leo friend a happy birthday in English requires a mix of sincerity, humor, and admiration for their unique qualities and strengths as a Leo. By acknowledging their talents, loyalty, and passion for life, you can make them feel truly appreciated and loved on their special day.