Susan Strong
Susan (full name Susan Strong) is from a tribe of underground fish people. It is unknown if she is a fish person hybrid herself; but it is implied at the end of Beautopia that she may be a human, like Finn.

As her title would suggest, Susan is both physically and mentally strong. She busts through Finn and Jake's wall in the beginning of Beautopia. It also appeared that she broke one of Finn's ribs when she was talking about his "brave heart".

Susan is afraid of anything new to her, as shown in Susan Strong. She also fears the Lub Glubs featured in Beautopia.

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