Henadic Theologian
Legend
The Zhentarim, Harpers, Order of the Guantlet, Emerald Enclave and Lords Alliance will also likely be factions, as they were the main factions in 5e. Red Wizards makes six, I could see say 4 more factions, who do you think they will be?
Some possibilities, Flaming Fist, Brotherhood of the Griffin (really like this one), Kraken Society, From Throne, Order of Blue Fire.
Some possibilities, Flaming Fist, Brotherhood of the Griffin (really like this one), Kraken Society, From Throne, Order of Blue Fire.