Son of a Helmut Zemo.

Real Name: Silvijia Sablinova, commonly addressed by the MC as Silver, is a confirmed Love Interest of the story. 

Age: 3-4 years older than the MC. 

MC age, 9. 

Silver age, Soon to be 13. 

Relatives:  

1. Earnst Sablinova(Father), Silver Sable(?). 
2. Anastasia Sablinova(mother). 
3. Heike Zemo(step-aunt) 
4. Helmut Zemo, Baron Zemo(step-uncle) 
5. Carl Zemo(first cousin, non-blood related). 

History: Silver is the Main Character's cousin. Although not blood related, her mother and MC's mother are step-siblings, whose relationship with each other is strong even to this day. 

She first met Carl when he was a baby and since stuck him like glue every opportunity she got. 

After her country's economy have been stabilize, her family becomes even more wealthy. She and her family are financially able to visit Carl who is living in another country, Sokovia, either by taking a commercial (or private) plane every day without putting a strain on her family's finance.  

But unfortunately for her, just because she can doesn't mean she should, as there are many possible circumstances that will stop her such as school, family business, weather problems, emergencies and such, but even then, despite living in another country, she is still able to leave a great impression in her cousin's heart. 

Silver is a real princess. While her father, Earnst Sablinova primarily work as a world-class mercenary, hunting criminals, protecting client and such, he is still a noble by name and law, possessing titles and real political power.  

Silver is a young girl who is madly in love with her younger cousin, Carl. She was able to confess her love to him at a young age (at the age of 12 when he was merely 9 years old), albeit the love confession was an accident at first but it didn't stop her as she went full attack mode.  

Although her confession was turned down by him at first, after a few minutes or so of talking to each other to understand WHY he think they can't be together, and having a mental crisis, crying, and giving each other their first kiss, wiping the other tears, and another (although lesser) mental crisis from other parties (Carl) and more kisses and crying, only then did she succeed convincing the boy she loves to accept her love. 

It was a messy start but it was a positive outcome.

There is no doubt on that very day where Carl stays by her side for many days and nights, all to help her cope with her trauma (of when she was attacked and betrayed by her own fellow martial practitioners), is the day she promised to herself, that she would do whatever it takes for her to be at his side as his wife as she realizes that no woman would allow his husband female cousin to be so close.

Personality: In the current chapter, it is unknown how Silver act outside her close family and friend, such as stranger, acquaintance and friend that she isn't considered close friend, but there is no doubt she truly love and care for her parents who loves her back, this includes aunt Heike and uncle Helmut as the two families have a great relationship with each other and the two also adore Silver as their daughter as she loves them back. 

But the person who holds her heart the most is a young boy named Carl, her cousin who is two to three years younger than her and also possesses extraordinary beauty and a beautiful heart who stayed by her side in her lowest moment. 

Ability: It is known fact that Silver not only received great martial arts training in all sorts of weaponry from blades and blunt weapon to empty hand but also possess a terrifying talent that has the potential to allow her to go toe to toe against other great martial artist and fighter in the Marvel universe. 

In another universe(616), despite the fact she is a biological born female, having all sorts of disadvantaged such as less muscle mass, less bone density, more body fat, and less testosterone hormone produced when compared to the physiology of a male body and other disadvantages, she is still able to fight Punisher off, a male anti-hero to a stalemate, who has an upper advantage in term of weight class, 100 lbs (or 45 kg) heavier. She is no doubt one of the rare genetically gifted that make other talented individual look averages, as she is more than capable of holding her ground, that the Punisher instantly realize that she was not a woman to be underestimated when she takes his punch as if it was a playful slap instead.  

Childhood friend.  

Surrogate Sister.  

Family 

Now, officially his girlfriend. Silver is no doubt, someone Carl deeply loves and treasures the most.  

It would not be a surprise even after half a dozen love interests exist in his life, she will still be in the top place in his heart. 

Currently in the story, Silver is the longest-known love interest of the MC. In fact, she is the only confirmed love interest, so far. 

There are plenty of differences between this Silver in this universe when compare to other Silver Sable in another universe such as the fact she is born much later and how her eyes are grey in this universe while in another universe, her eyes are blue. 

There's also the fact her father is much more expressive of his love toward her daughter, rather than just strict and cold-face 99% of the time when the two are together, or at the very least he has his wife on his side and how he is much younger when compared to his other version where he lives long enough to experience (post) WW2 and met Captain America.