shy, dreamer, and awkward are all personality types i'd love to see!! (tsundere would be really, really cute as well, but i doubt it'd happen.) i don't really have any preference for which gender they'd be allotted to, but... hm.
shy's pretty self-explanatory. like sable, but expanded. they would never ping you at first, but once you talk to them more they start to open up, first by sending letters and eventually approaching you first. they'd tell you 'secrets', joke around a little and display emotions more often (and maybe act a little surprised after they do!). they'd give you gifts more often than others, since they're so glad to have a friend.
dreamer is sort of capital-R Romantic, but, y'know, for kids. they'd act laid-back and calm, generally, andbe hard to rile or upset (but would perhaps be prone to occasional burst of emotion?); however, it'd be harder to establish friendship with them, as they'd be somewhat loner-ish. you'd catch them wandering around in thought a lot, especially around the beach, but instead of dismissing you when you approach them, they'd tell you what they were daydreaming about. they'd have a higher rate of planting/tending to flowers than the other villagers do, maybe even planting hybrids occasionally at maximum friendship. they'd probably ping you to read you their (cheesy) poetry. something involving art... maybe they'd have a higher chance of giving you a real work of art from redd, rather than a fake?
awkward is also what it sounds like. could maybe also be called 'dopey'? they'd trip sometimes when they walk and accidentally say things that sound insulting, but they're so earnest and apologetic afterwards that it would be hard to hold it against them. they'd show up uninvited at your house more often since they have no sense of personal boundaries, and when they'd ping you, they'd go off on long, possibly somewhat tmi rambles, but if you have a high enough friendship with them, they'd give you a gift afterwards for 'putting up with' them. they'd also tend to display the more extreme emotions and have stronger emotional reactions when talking to you or the other villagers.
i'd also like to see more diversity in the individual personality types! so even if you have duplicate personality types in your village, they wouldn't just both tell you the same things all the time. one villager's 'constantly on-edge, angry, loud' cranky could be another's 'long-suffering, blunt, done-with-this-crap' cranky. more depth, basically, so that an individual seems more like an individual rather than just a single personality type.