Well, GI Joe is in stores and so are a number of action figures for Star Wars, Marvel Comics super heroes and that type of thing. My boys are 2 and 4 and LOVE the Imaginext stuff -Batcave, Space Shuttle, Pirate ship -they all come with little figures. Just be careful with the Playmobil stuff for your son's age. My 4 year old loves it and so does my 2 year old, but we didn't get him any for Christmas because so many of the parts are SO tiny! He's not bad about putting stuff into his mouth, but it still worried me. He does play with his brother's Playmobil stuff, but someone is always around. When my oldest was 2 and 3 he LOVED Barbies and princess stuff. My 2 year old loves baby dolls and has one he carries around. He's so sweet patting its back in a comforting way! I say get him his own Barbie and Ken or a GI Joe or something or just let him keep playing with his sister's stuff. Social norms creep in soon enough and he'll probably not want to play with it anymore in a few years.