Semyon is Senya, and who is Arseny?

Arseny is Senya's brother. He is the younger sibling of Senya, and is often seen as a mischievous and daring individual. He is known for his boldness and willingness to take risks, which often leads to trouble. He is often the one to suggest wild ideas and schemes, which Senya is usually more hesitant to try. Despite his mischievous nature, Arseny is a loyal friend and brother who is always willing to help out in a pinch. He is also known for his quick wit and ability to think on his feet. Arseny is a loyal friend and brother, and he will always have Senya's back.