der Champion
champion
The winner of an important competition or championship, especially in sports.
Nach einem spannenden Finale wurde er zum neuen Box-Champion gekrönt.
After an exciting final, he was crowned the new boxing champion.

champion
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champion
The winner of an important competition or championship, especially in sports.
Nach einem spannenden Finale wurde er zum neuen Box-Champion gekrönt.
After an exciting final, he was crowned the new boxing champion.

The main meaning of 'Champion' (champion) refers to sports. The figurative meaning 'Verfechter' (advocate) is less common and is often made clear by the preposition 'für' (for) or by the context, e.g. politics or social issues.
Er wurde zum Champion für den Umweltschutz, als er begann, öffentlich gegen die Abholzung zu protestieren.
He became a champion for environmental protection when he began publicly protesting against deforestation.
In a sports context, 'Champion' (champion) is often combined with the discipline or title to form one word. Examples are 'Box-Champion' (boxing champion), 'Welt-Champion' (world champion), or 'Olympiachampion' (Olympic champion).
Als amtierender Welt-Champion stand er unter großem Druck.
As the reigning world champion, he was under great pressure.
In the meaning 'Verfechter' (advocate), 'Champion' (champion/advocate) almost always appears with the preposition 'für' (for), followed by the cause or group of people one supports.
Die Anwältin gilt als Champion für die Rechte der Verbraucher.
The lawyer is considered a champion for consumer rights.
The word 'Champion' (champion) is often used in international sports journalism. It often sounds more prestigious and international than the German word 'Meister' (champion/master).
Nur ein wahrer Champion kann unter diesem Druck gewinnen.
Only a true champion can win under this kind of pressure.
king
'der König' and 'der Champion' can both mean a person who is at the very top in a field. 'Champion' fits especially with sports, competitions, and championships. It is usually about an official victory. 'König' is more figurative and flexible: you call someone this when they are considered especially good, well-known, or successful in a field. So a champion has usually won a competition. A king in a field does not always have to have an official title.

Nach dem letzten Kampf wurde Ali endlich Champion seiner Gewichtsklasse.
After the final fight, Ali finally became champion of his weight class.
Für viele Fans bleibt dieser Sänger der König der Popmusik.
For many fans, this singer remains the king of pop music.