In the Black Clover manga, Yami doesn't meet his end. He continues to play a significant role and faces various challenges but manages to overcome them.
Asta's age in the Black Clover story arc changes over time. At the beginning, he's around 15 years old, and as the story goes on, he gets older. The exact age depends on the particular events and chapters.
In the Black Clover Yami Story, Yami is the key figure, of course. But other important characters include his squad members in the Black Bulls. There's Noelle Silva, who has her own growth arc and is often involved in the adventures with Yami. Then there's Finral Roulacase, who provides some comical relief at times but is also a useful member of the team. All these characters interact with Yami in different ways and contribute to the overall story.
Yami is a really cool character in Black Clover. His story is full of action and growth. He comes from a different land and brings his unique fighting style to the Clover Kingdom. He's a strong magic user and also a great leader in the Black Bulls squad. He has a rough exterior but a good heart.
One plot idea could be Yami going on a solo mission to a mysterious and dangerous land. He has to face powerful new enemies and discover secrets about his own past. Another could be Yami training a young and inexperienced magic knight, sharing his unique combat and magic knowledge.