I'm not sure if E will be an extrovert or an introvert yet. I go back and forth all the time with what I think. He's a Gemini like me, and usually needs a lot of time to recover from any outings we have (of course that could just be a baby thing). On the flip side, he loves social interactions and is always wide eyed, taking it all in.
Tom and I may both be rooting for an introvert, mostly because we don't know what to do with an extrovert, but only time will tell. Either way, he'll have some good friends by his side that he'll be able to say he's known his whole life. Granted they're my godchildren and he doesn't really have a choice, but I'm pretty sure he'd love them anyway cuz they're pretty amazing.
It's awesome for me to watch them interact and think about them growing up together. It's definitely one of those moments where it hits you that you're the adult now. (It doesn't matter how old I get, I still feel like a kid). Making plans for the next generation goes a long way to making you feel older and responsible though. I don't know if I'll ever get used to the feeling!