masculine       der Schal scarf   rot red           Er kaufte sich einen roten Schal. He bought a red scarf.

Der Schal is masculine, singular. Der Schal is direct object (Accusative). If we check in the table we'll find that the ending is -en and the adjective is roten.

masculine       der Charakter character   ehrlich honest         Er hat den Charakter eines ehrlichen Mannes. He has the character of an honest man.

Der Charakter is masculine, singular. Eines Mannes is Genitive. If we check the table we'll find that the ending is -en and the adjective is therefore ehrlichen.