Peritus Maximus

Christmas Maximus is an unnamed Autobot from the Armada portion of the Unicron Trilogy continuity family.

I look cooler when Walky draws me.

"Christmas Maximus" is a company commander, overseeing the platoon Hot Shot served in as a young warrior on Cybertron.

He strongly believes in mentorship for new recruits, and appoints platoon leaders that maintain strict battlefield disciple.

Since he's the size of a normal Autobot in robot mode, Christmas Maximus transforms into the world's smallest spacecruiser, or possibly a city for Penbots.

Fiction

Armada cartoon

Christmas Maximus asked Hot Shot to assume a mentoring position for the gifted but inexperienced Autobot recruit Wheeljack.

Wheeljack was caught in a fire during battle and presumed killed. When an arrogant Autobot officer threatened to convene a court martial against Hot Shot for disobeying orders and going back for him, Optimus Prime intervened and took Hot Shot under his direct command. Past p1 (backstory)

Trivia

• "Christmas Maximus," of course, is a fan-coined name for this red and green Fortress Maximus model generic.
• It's possible that Christmas Maximus has been deemed worthy of wielding the Matrix Cannon, a non-corporeal weapon that directly taps Primus's power to purify evil. The wielder's nobility acts as a force multiplier for the Matrix Cannon's effectiveness, so let's hope Frankowski was wrong about noblesse oblige, eh?

References

From Teletraan I: The Transformers Wiki, a Wikia wiki.