the characters ... are paper-thin , and their personalities undergo radical changes when it suits the script . 
(ROOT (S (S (NP (DT the) (NNS characters)) (, ...) (VP (VBP are) (ADJP (NN paper) (HYPH -) (JJ thin)))) (, ,) (CC and) (S (NP (PRP$ their) (NNS personalities)) (VP (VBP undergo) (NP (JJ radical) (NNS changes)) (SBAR (WHADVP (WRB when)) (S (NP (PRP it)) (VP (VBZ suits) (NP (DT the) (NN script))))))) (. .)))
(ROOT (S (S (NP (DT ) (NNS )) (, ) (VP (VBP ) (ADJP (NN ) (HYPH ) (JJ )))) (, ) (CC ) (S (NP (PRP$ ) (NNS )) (VP (VBP ) (NP (JJ ) (NNS )) (SBAR (WHADVP (WRB )) (S (NP (PRP )) (VP (VBZ ) (NP (DT ) (NN ))))))) (. )))