I preferred Mezoti over Naomi, Icheb and Harry Kim! Seriously she would have been great. Should have lasted till S7. ETA: She did! I wanted to see her on Earth. http://www.imdb.com/name/nm0565703/ Awww!
I don't prefer her over Naomi who I adore but I do like her greatly and would have been happy to have her stick around. But a lot of people would freak, having kids in Star Trek having been so disturbing in the past The twins though, glad to see them disappear.
Mezoti should have stayed, both to give Naomi an age-appropriate playmate and to give Harry someone to tell his troubles to (as he did after Lindsay Ballard left the ship; he gave her Lindsay's hairbrush).
Also there should have been pets on board. Janeway should have found a dog like animal somewhere and kept it. They could just glue a unicorn horn on some dog's head for the series so we knew it was an alien dog. Or be real cheap and use a Chinese Crested like they did in Two Days, Two Nights on ENT. Though I don't imagine that would be Janeway's kind of dog.
She should have taken that spider monkey creature she and Chakotay saw when they shacked up on that planet together.
If Q could turn Beverly into an Irish Setter in one episode, surely he could have zapped up one for Janeway.
Well she was the most lifelike of the Borg kids... not saying much with that though. For whatever reason they made Icheb the "star" of that mini collective... whom I swear must be distantly related to Harry Kim.