How is it possible to be in the company of figures other than prophets in Paradise, such as Antarah ibn Shaddad and Al-Mutanabbi, and would that be through supplication and charity?

Love is a reason for a person to be with those they love on the Day of Resurrection. So, whoever loves the Prophet, peace and blessings be upon him, and his noble companions, will be resurrected with them. And whoever loves the people of disbelief and wickedness may be resurrected with them. Loving celebrities who died in disbelief or who were not known for righteousness and piety, and wishing to be resurrected with them, is a great danger. For whoever loves a person who violates the Sharia will be with them in their destiny. As for loving the pious saints of Allah, it is among the firmest bonds of faith.