First is Rag brothers. Both of them are hardly visible in the show & come once in a blue moon. At least in Kannada & Tamil versions, they have got roles.
Then it is Urmila's husband Jeetubhai who didn't have much role to play & is not to be seen after 10 year leap.
He could have been utilized to confront Urshi for mistreating Gopi & foiling their plans. He could have been utilized for ensuring that Gopi gets a quality education & is not deprived of anything apart from his business.
Next is Jigar. He could have been utilized to catch Rashi red-handed for plotting against Gopi & foiling her plans apart from his routine life. No one ever know most of Urshi's kalakaris. They got to know very few of them & that too at a later stage.
Even Ahem has been in the background most of the times though he was given more role than other men in MB. He too could have been utilized to find out who did online shopping in Gopi's name the moment he got to know that Gopi is illiterate no matter how much angry he might have got at that point of time. That is if the CV's wanted Gopi to be an unpad at that time.
When a person is illiterate how can they know about computer, Internet & online shopping? Without English, there is no IT.
Then comes Gopi's dad, Jayanthibhai. He is almost out of the show. It was only said that he went abroad. But then he would still be in contact with Madhu & his daughters wherever he is. He could have been utilized to confront Madhu for what she is doing now.
The CV's could have utilized Radha to bring Urshi kalakaris to light before the Modi family & could have got Rashi banished along-with Gopi (if at all the CV's wanted her to be out of the house for 8 years).
They could have put it this way. Gopi & Rashi being independent. The Modi family getting the news about them & taking them back. Then Kokila catching Radha & Tripti rescuing Meera from them. There was no need for the CV's to take 8 years to do these things. They could have taken 6 months or at the most one year for doing these.
Even Sahir & Samar were not utilized properly.
They could have made Urmi & Madhu as rivals with Gopi being with her parents & Radha from her childhood. Both of them being as educated as Rashi. They could have kept Gopi simple & straight-forward even as a highly educated woman.
There are many examples where the characters could have been utilized in a proper way either positively or negatively.