He has such a cupcake face I would just like to give him a hug.
You obviously are v aware of who all I play so I will skip to what I think are the biggest immediate potential friendships and all that jazz~
Its a good thing for his sake Lando isn't the jealous sort rofl He'll be working with Lucy and Caitlin who I definitely think will both very much enjoy him and both have enough experience with The World Being Bullshit to relate to his history. He's living with Bellamy and while I don't think they'll be close by any metric - I feel like they'll get each other and plus if he ever visits Clarke he'll see him around at medical.
Other than the above... I definitely think he'd get along well with at least Jacen, Lexa, and Allison additionally.