Question: Is it alright to matchmake good friends who are good in character?
Answer: It does not accord with a Bodhisattva Precept in the Brahma Net Sutra to do matchmaking – as it facilitates the perpetuation of Samsara by encouraging attachment. You should encourage them to learn the Dharma instead. Whether they become attached or not will not be of your doing, while they might become spiritual friends!
We should want to unite people in the Dharma, as spiritual friends who help one another to be liberated from Samsara; not to unite people in Samsara, as worldly partners who ‘help’ one another to stay trapped in Samsara indefinitely. Without the Dharma, attached or not, one will stay trapped.