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Description
I headcanon that before he got to meet BT21, Chimmy's only friends growing up were some rats he befriended on the streets. He enjoyed telling them stories and playing the harmonica for them.
However, one rat that marked his life the most is Soot, a little black mouse who became Chimmy's best friend. Whenever Chimmy goes out to play his harmonica, Soot is sure to follow him behind, secretly as to not scare people who are interested in watching Chimmy play the harmonica.
Unfortunately, old age caught up to Soot and he passed away shortly before Chimmy joined BT21, leaving the heartbroken dog alone once again. The bright side is that he didn't have to be alone for too long for his harmonica playing caught Tata's attention, and the rest is history.

Description
I headcanon that before he got to meet BT21, Chimmy's only friends growing up were some rats he befriended on the streets. He enjoyed telling them stories and playing the harmonica for them.
However, one rat that marked his life the most is Soot, a little black mouse who became Chimmy's best friend. Whenever Chimmy goes out to play his harmonica, Soot is sure to follow him behind, secretly as to not scare people who are interested in watching Chimmy play the harmonica.
Unfortunately, old age caught up to Soot and he passed away shortly before Chimmy joined BT21, leaving the heartbroken dog alone once again. The bright side is that he didn't have to be alone for too long for his harmonica playing caught Tata's attention, and the rest is history.