Berkut

Hello hello~! Mia here-

Today I bring you my personal build for berkut, I will note his stats in my explanation as +10, 5df, and married (S-rank SS)~

As everyone knows, the Rigelian prince had been screwed over by FEH as a good amount of strong, beloved characters did and ended up as garbage. Yet, to those wanting to bring out the true monstrosity he deserved to be I bring you this build.

As you can notice, this build definitely doesn't focus on his offensive stat, instead it breaks it down with the fortress skills but still leaves offensive capabilities. With Berkut's Lance(+def), Fort. Def/Res 3 and Fortress Res 3 it should leave you with an incredible bulk of 59HP/49DEF/49RES when getting attacked. Which to me, sounds good. I built him to be a cavalry tank, easy to move across the battlefield to whereever he is needed.
I chose Aether to further make him be able to handle more. Because of his terrible speed which is 29 at that point, he'll get doubled alot, so Aether should charge fairly quickly and bring him back to glory again in time of need. I chose Panic Smoke 3 to increase his capabilities when surrounded. Any opponent that dares come buffed would soon have their gained strength get taken away. Dull Ranged 3 was a reasonable choice for a B skill, neutralizing the threat of bladetomes for the most part.

I know this build practically works on everyone, and maybe even better on them, but I still wanted to show this off, because Berkut is a villain very precious to me.

Have a good day/night/whatever~ Mia out~

Ok, This is the build i am personally using for my Berkut and from my expirience it is great.

At +8 merges and four flowers with this build he reaches 54HP, 48 Atk, 25 Spd , 42 Def and 43 res,
if u ad eir support during light season this goes up to 59 hp and 48 res.

Know i know you will say "oh what is this buil he can't even counter attack". And to that i say to shut your mouth and listen, you use this build as a straight up mixed tank for AR-O during light season that nullifies foes buffs and debuffs their attack for a easier time taking them out

This works well because his mixed bulk lets him take samll to no damage from some units and also nullifie their buffs

I really recomend this build and hope you have a great time using it

*note*
Can use any smoke (even panic or pulse) with the same efficency and if you want to be more budget you can swap fort. DEF/RES for Fortress res

Take care!

Build Name: Prideful Douchebag {Lv.40+10}

This build makes the best out his, mediocre at best, stats. This is one of the only builds that I can come up with that allows Berkut to actually win on his own.
His lance creates a nice little way of tanking magic users, distant counter allows him to attack both close and ranged magic people, panic+his HP creates reverse bonus effects upon enemies, and fierce stance boosts his chance of actually killing someone when attacked.

A build I am working on getting at the moment.
Holy Grails really opened up the free units for more potential and better builds.

This Berkut is made to counter mages.
The higher the res, the better.

Berkut's Lance with +Res refine is obvious, more res.
Reposition to help move allies closer or further from enemies.
Aether to help get health back and allow for a bit more damage.

Distant Counter to help counter mages.
Quick Riposte to allow two guaranteed hits when foe initiates.
Even Res Wave to allow more res, of course.
And, Res +3, you get the idea.

Mixed tank build for Berkut, fully merged at 3* he reaches 36/36 defences during the enemy phase and bumps his attack to 53 while he's at it. This, combined with his high HP means that Berkut will survive most encounters if you're smart with him.
It's a rather straightforward build, but it turns him into a great tank for a cavalry team. Berkut is a hero who gets way more hate than he deserves.