I didn't know, that ther is Villain Wiki but, they certainly covered Heroes of Might and Magic saga, let see:
https://villains.fandom.com/wiki/Sandro_(Enroth)
https://villains.fandom.com/wiki/Deemer
https://villains.fandom.com/wiki/Finneas_Vilmar
https://villains.fandom.com/wiki/Archibald_Ironfist
https://villains.fandom.com/wiki/Zydar
https://villains.fandom.com/wiki/Calh
https://villains.fandom.com/wiki/Tamika
https://villains.fandom.com/wiki/Lord_Haart

Though the pages are ridden with adverts, like most "commercial" wikis, the content deserve praise. I liked how they summed it up ;)