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