I enjoy Varka being just some random guy who rose to the top through skill and a shit load of determination and resilience, but I also like the idea of him being the younger brother of Frederica.
Just imagine working incredibly hard, making your parents proud by being a proper, disciplined Gunnhildr heir, only for your scruffy lazy little sibling with a truancy problem to overtake you and to end up a higher rank than you. Frederica being livid, and so begin the endless squabbles!
Varka loves teasing her, and she'd smack him around the head in return, scolding him for making a mockery of their family and the lecturing him about the importance of legacy.
Exasperated by childish nicknames, having a go at him whenever he calls her Freddie in front of a squad of knights she's commanding. Still, even if she's sick of him and perhaps a teeeeny bit jealous, Frederica worries about him a lot. Always going out and doing reckless things --- Varka's going to get himself killed one of these days!
When the expedition was being planned, and Frederica was told exactly what her little brother was going to do, she was so anxious for his safety that she considered trapping him inside the basement of the Gunnhildr mansion and keeping him there for the rest of eternity.
Varka as an uncle? Bad influence. Stay away from Jean and Barbara; don't corrupt them with whatever you've got going on! Took them out often (read: snatched them from underneath their parent's noses) to explore Mondstadt's wilderness, which lead to both Freddie and Seamus losing hair from stress. The rest of it? Rapidly going grey.











