the characters are based on stock clichés , 
(ROOT (S (NP (DT the) (NNS characters)) (VP (VBP are) (VP (VBN based) (PP (IN on) (NP (NN stock) (NNS clichés))))) (, ,)))
(ROOT (S (NP (DT ) (NNS )) (VP (VBP ) (VP (VBN ) (PP (IN ) (NP (NN ) (NNS ))))) (, )))