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what is the dakuten katakana character in the image ?
Seem the image say Xサ?What is the X ?
It's グサ, a common onomatopoeia for a sound of "stab". It also describes how someone's harsh word sticks into your heart. It's listed on jisho.org in the form ぐさりと.
It looks like ワ, too, but ワ does not take dakuten, as you know.