Final answer:
A good king/leader according to Beowulf is hardy, rich, wise, merciful, just, true to their word, benign, honourable, ambitious in warfare, and possesses a handsome person.
Step-by-step explanation:
The characteristics of a good king/leader according to Beowulf include being hardy, rich, wise, and merciful and just in all men's eyes. They are also true to their word, benign and honourable, and maintain a stable royal state. Additionally, a good king/leader is ambitious in warfare and possesses handsome person.