Base for 6" scale boy figure for custom

[JimboJones]

I want to make a custom action figure of my 4 year old son to fit with his 6" scale marvel legends collection. Looking for ideas for a figure to start from. It doesnt have to be perfectly in scale but i would like to get it close. Maybe a 3-4.5" figure in that style. Any help would be much appriciated. I have searched a bit and come up dry so far. Thanks in advance.

[Belmont13]

The only ones I can think of that are about that size are Rocket Raccoon, Puck, Hit Monkey and the Franklin Richards from the FF boxset. Those are the ones that come to mind in relation to Marvel Legends scale, maybe there are better choices from another line/company but I can't think of any that would fit with Marvel Legends.