When Moldova and Estonia were children, Moldova got in trouble and Estonia stood up for her.
Moldova and Estonia have a normal relationship though it is said people think they are in love due to Estonia bothering her at times and them being together. Romania, on the other hand doesn't like Estonia because he thinks that he is in love with her. He is very over protective over Moldova and didn't want to lose her to any guy(especially Sweden).
Moldova and Estonia do not have a similar personality. Moldova's personality is like the personality of Sweden(due to her boring-like traits and she does not smile that much except when she sees vodka or cake). Estonia's personality is much different(much different).