I didn't RP Jory much as a first year, hardly ever at all but with Adi I really enjoyed doing it. I thought it was going to be difficult, getting into the head of an eleven year old. But I was surprised when it turned out to be easy because in some ways, I haven't totally gotten rid of my childish side. I RPed Adi in a way I think was very realistic to his age. Take for example, in one DADA class, he answered nothing because despite being half blood he did not know much about Dark detectors. No young one would know the answer to everything, so I think that's the way they should be RPed. Adi's going into second year and I'm still going to have him sit in some classes silently because he doesn't know all the answers. Academics aside, firsties can be however they like: childish, rebellious, mean, fun, prankster. It's all in the fun
Do I think people RP realistically through the years with their charries? Honestly, no. We see some first years knowing the answers to practically everything. As they grow older, that's okay because we can all assume they read more etc but when they're firsties or second years knowing everything is highly unrealistic.
To pick my models, I just see someone I like and go
"Hey! You can be my charrie's model!'' For Jory, it's Mitchel Musso. I picked him because I loved watching him in Hannah Montana. For Adi, it's Yatharth Ratnum. I chose him because Adi is an East Indian and I am a fan of Yatharth who is a singer.