I have read almost all the novels except Ajaya, and I have found one interesting thing. The protagonist is always a victim and is supported as well as glorified by Krishna.
In Draupadi-centered novels, Krishna praises only Draupadi and no one else. and as Shreya said, He is often paired with Draupadi 🤢
In Arjun-centered novels, Krishna says that Arjun is the best but in Karna-centered novels He says just the opposite 😆
In ArDi-centered novels, Krishna blames everybody for making Draupadi wife of 5 husbands.
In Bheem-centered novels (though I have read only 1 of this type), Krishna supports Bheem and criticizes the others.
Don't know the condition of Duryodhan-centered novels since I'm yet to read Ajaya.
Last but not the least, there is one common factor in all the books mentioned above. That is, poor Dharmaraj Yudhishthir is demeaned and disrespected in all these books. Whoever the protagonist is, to glorify him/her Dharmaraj is bound to be vilified 😭