Characters in my point of view Bidaai Preleap and post leap:
Mamaji – before leap he was man who lived by principles and stood by truth, post leap hypocrite with advice to reveal/hide truth based on convenience.
Mamiji – before she was concerned for Ragini and resented Sadhana most of the time before the reunion of sisters and mamiji-Sadhana, now she is concerned for Tamanna and resents Ragini's bond with Khushi. So back to square one.
Vasu – Same as before – Manipulating, Misunderstanding till it's too late,possessive and obsessive mom using same means to bring happiness in her son's life as before except that she couldn't get lucky as before in her choice of girl.
Indrajeet – Whatever he says or does are as unimportant as before if not more.
Ranvir – preleap only character which was always shown positively by cts, post leap literally butchered by cts to promote new track.
Ragini – insecure and gorgeous as before if not more.
Alekh – Same as before except before he was obsessed with hatred for Vasu, now he is obsessed with Sadhana's memory and her return.
Vinu – preleap failure both at handling wife and career who needed Sadhana to bail him out most of the time, post leap successful at both at wife and career.
Malti – Always pining for things which she doesn't have.
Gunni – preleap, she was a kid, now she is an adult with a very selective memory regarding her childhood, for example she doesn't remember her own parents, let alone remembering her Ranvir Chachu. Also I find it very contradicting that cts are showing Khushi having issues like being shy and sacrificying as affect of being motherless and in a way fatherless even after having Ragini to love her, whereas Gunni seems happy confident with no negative effects of not having parents while growing up in boarding school(as they are in jail) .That must be some boarding school where she grew up.
Apoorva's role – Too good.
Sakshi: in same situation as Sadhana – Orphan, marrying Alekh as a deal. But whereas Sadhana could give up anything for other's happiness, Sakshi can snatch anything from others for Taruns/her happiness, in others words Sadhana was selfless, Sakshi is selfish.
And RS asks viewers to look at post leap Bidaai as Bidaai season 2 where most characters are same as before except the charm of freshness and foursome.