Despite his intimidating exterior, Berwald is the best father anyone could ask for.
Tino avoids spending time with Peter because he is so ashamed of being called "mama" and it kills him a little each time. But what kills him even more is how sad it makes Berwald when he does this because Peter is one of the only things that brings the man joy.
Sometimes it hard for Tino to get Berwald to leave Ikea... He tends to get lost while looking for the Swede.
Whenever Tino wants Berwald to do something for him and he's not complying, he make big puppy dog eyes and a pouty face then say "Not eve for your wife?" It works every single time.
They have wedding rings. Tino was embarrassed about Berwald buying him a ring. He doesn't wear it, but he's always kept it. Berwald on the other hand, wears his everyday.
Berwald decided that Tino was going to be his "wife" long before they ran away. Probably from the moment he saw him.
Tino probably calls him "swedey pie" every once in a while
It took five men and Tino to get Berwald to stop living in Ikea.
Many of the nations think that Berwald took Lukas away from Mathias either out of spite or because he needed to lash out at someone when Ivan took Tino from him. It was actually neither of these reasons... He was just lonely without Tino.
Imagine Peter going through an emo phase and is all grumpy because "nobody understands me" and he's over at the nordics hiding from Arthur and he's playing pop punk music loudly and Tino's just like "That sounds like my music!" Then turns on really loud heavy metal.
Tino's the type of person who wouldn't tell Berwald that his glasses are on top of his head and pretend to help him look for them around the house while giggling... Berwald falls for this all the time.