If I were writing for IDW, I'd write him the same way I'd write any veteran Optimus: as a crusading force of nature that truly believes in "freedom is the right of all sentient beings." In a galaxy of compromise and concessions, he's the guy that draws the line, and God help you if you cross it. Interspersed with modern stories about him, I'd include flashback story arcs explaining how he got to be like this, where his beliefs stemmed from, why he's so uncompromising. I don't think that the core of the character is freedom, it's love for his fellow man. The "freedom is the right of all sentient beings" is an outgrowth of this love.