Untenmaru has a generally rectangular face shape. His dark hair is short on the sides but comes to a swoop at the top. Untenmaru's eyes are narrow and typically furrowed. Giving him a stern look. He has a noteably large fluffy mustache that parts in the middle accompanied by a strip a facial hair lining his chin. He is seen wearing formal wear consisting of a dark suit and a tie.
Not much is known about Untenmaru's personality, however, he comes off as rather aggressive as seen when he angrily shouts back at Katsuki Bakugo after the student makes a degrading comment towards Endeavor's car. He also does not hesitate to speak his mind in Endeavor's presence about his actions and who he associates with.
Once Endeavor's interns finish dinner at the Todoroki Abode, Untenmaru is present to drive the students and Endeavor to U.A. High School. On the road, Katsuki sharply comments on the size of Endeavor's car as he looks out the window, and, taking offense at his words, Untenmaru loudly complains to Endeavor and criticizes his choice of passengers.
Right after, the appearance of the villain Ending causes Untenmaru to angrily yell at Katsuki to bring his head back into the car as he forcefully swerves to avoid hitting the villain. As the students rush out after Endeavor to fight, Untenmaru sends them their equipment.
When the battle ends and Endeavor makes his report to the police, Untenmaru advises the Hero to be more cautious with the two attacks that had targeted him in the span of a few days.
|241. Do That Interview!||Absent|
|242. Have a Merry Christmas!||Absent|
|243. Off to Endeavor's Agency!||Absent|
|244. Recommended Reading||Absent|
|245. Rise to Action||Absent|
|247. Status Report!||Absent|
|248. One Thing at a Time||Absent|
|249. The Hellish Todoroki Family||Absent|
|251. Just One Week||Appears|
|252. The Unforgiven||Appears|