Putting my response in spoiler since I tend to go overboard with the length in each answer. *point upward at Kolya's earlier reply*
D -- Making sure that submarines will gain an equal respect to surface ships. He doesn't like it that lots of times submarines are deemed to be 'slackers who only do actual work less than 1/10 of the time they spend underwater altogether'. Surface ships and ordinary humans just do not understand what kind of exhausting job it is to be underwater for a long extended period, trying to camouflage their presence without being detected by the enemy.
M -- Not very high, he doesn't shy away from stealing an opportunity to strike when one's back is turning to him. If it will guarantee his victory he will certainly do it. Morals and compassion in battles are nothing short of stupid mistakes that can lead to one's downfall.
I -- High intellectual intelligence but rather low emotional intelligence. After all, being an artificial humanoid android means he doesn't understand emotions from the start. Such androids will learn and comprehend of humans' emotions only when they browse into the data about them that has been programmed into their inorganic brain, something that he refuses to do so far other than very few emotions which limited to anger, hatred, disgusted and pride.
T -- No scars and piercings but he has this 'tattoo' on the right side of neck engraving the submarine code number (TK-208). All members of his class have this type of tattoo to help identifying each of them during the USSR era when submarines still lacked individual names.
R -- Not much these days since he's nearly semi-retired. Patrolling the territory of his 'home' (Sevmash shipyard) then returns to the place he's assigned to, which is not too far from where his last two younger siblings stay and picks a fight with those two every now and then.
I -- If it's concerns the experience and tactical knowledge related to SSBN's main task, no one in Russia can beat him since he's the most senior among all submarines currently serving in the Russian Navy. He's a go-to guys for flagships from various fleets when it's about submarines' operation...though they have to contact him through their own submarine subordinates since Mitya is unlikely to open up to surface ships easier.
Y -- Because the real TK-208 is the last active project 941 Akula-class aka the largest submarine in the world. And the fact that TK-208 being a testbed for the missiles used on the Borey-class SSBNs which are my initial main OCs in this plot was just begging for me to create this OC.
D -- Obliterating the flagship of Russian Navy... *again, points upward at Kolya* Nope, he doesn't want to do it to prove that submarines are superior to surface ships. He just has had enough of Kolya constantly invading his personal space (which he requires a lot).
O -- Nicknamed 'Grumpy Shark' by Kolya because he's just that...always grumpy and the name of his class 'Akula' means 'shark' in Russian.
N -- Being cordial with Kolya. Surely if there's a war and the situation requires him to cooperate with the surface ships to form an effective task force combining of submarines and surface ships, he would put the priority of national's interest above his own preference. Still, that doesn't mean he wants to come face to face to plan the strategies with Kolya. There will certainly be a submarine who will act like a 'medium' and convey Mitya's communication to Kolya, while Mitya himself still being the same anti-social grumpy old shark. LOL
S -- He only appears anti-social to the surface ships while more relaxed among submarines. While the younger and smaller subs are intimidated by his presence to some degree, he always protects them if needed, even if they're not 'born' in Sevmash. The only two submarines in Russian Navy not in a friendly term or respected of him are, strangely enough, his own younger siblings.
K -- I'll take a quote from him... 'I DO NOT have time for that crazy, disgusting thing! Let humans have them alone!'
O -- Before Kolya's arrival to the Northern fleet, Mitya's main rival was Kirov, who now stays immobile and in an amnesic-liked state not far from him in the same Sevmash shipyard waiting for his demise. Yet, while he's still in a not-so-friendly term with Kirov to these days, Mitya instead has been in a much softer stance toward Kirov's younger brother, Pyotr Velikiy.
Y -- I need at least one older submarine that Sashka wouldn't dare to piss of. :'D One that can easily beat Sashka into pulp if his lack of respect toward older submarines goes out of hand.