Sawamura is a lean-built teenager of average height . He has dark brown hair with brown eyes. He is often seen with a smile. He prefers to wear his hat frontwards.
Sawamura is hotheaded and loudmouthed youth, usually coming off as obnoxious. After he arrives at Seidou, he quickly makes himself known for his stupidity, because of his strange antics and because his knowledge about baseball is mediocre, at best. Despite his shortcomings, his disruptive nature often helps to ease a tense situation. Because of his strong-will and spirit, gets he always inspires his teammates to continue playing their best. He is also surprisingly level-headed in critical situations, as he was always in a pinch with his weaker middle-school team.
As the show progresses, Sawamura is not one of typical players, but also not the most outstanding one. He makes errors which makes him realize his mistakes, sometimes with the help of his senpais. He is ready to learn new things despite his inability to analyze his potential faster than what is expected him and he is a pitcher who throws with his feelings, and is never ashamed to show everyone what's on his mind. He performs his best when he feels the intensity and want of his team to win, and likewise, he is easily swayed and his performance drops.
He treats his teammates depending on how they treat him, with Haruichi quickly becoming his friend. He is respectful towards majority of his senior teammates like Chris, Yuki, Isashiki, and Ryousuke, but he is more familiar towards Kuramochi and Masuko. He is blunt and rude with Miyuki because of his relentless teasing. The person he never wants to show weakness to is Furuya, a fellow-pitcher. They are often seen arguing which ends up the latter ignoring Sawamura.
At academics, Sawamura's output is poor and he needs constant cramming in order to pass his exams but gets help from his classmate, Kanemaru Shinji.