▁studies . ▁He ▁lik es ▁Y um ek o , ▁however ▁also ▁K em um aki ▁is ▁always ▁after ▁her . ▁He ▁also ▁tr icks ▁H att ori ▁to ▁help ▁him ▁in ▁any ▁situation , ▁even ▁in ▁extreme ▁ones ▁( e . g . ▁in ▁one ▁episode , ▁he ▁wanted ▁training ▁to ▁become ▁a ▁full - f led ged ▁nin ja ). ▁He ▁also ▁does ▁not ▁follow ▁his ▁mother ' s ▁instructions ▁properly ▁and ▁often ▁gets ▁a ▁severe ▁sc old ing ▁from ▁his ▁mother . ▁Though ▁he ▁doesn ' t ▁study ▁well , ▁he ▁has ▁a ▁good ▁habit ▁of ▁helping ▁others . ▁He ▁is ▁always ▁the ▁victim ▁of ▁K em um aki ' s ▁m isch iev ous ▁plans . ▁▁▁ ▁( voice : ▁Y ū ko ▁M ita , ▁drama ▁actor : ▁Sh ig ek i ▁Nak aj ō ) ▁Sin zo ▁is ▁Kan zo ' s ▁younger ▁brother . ▁He ▁uses ▁weapons ▁made ▁from ▁wood . ▁He ▁is ▁a ▁nin ja - in - training ▁who ▁lear ns ▁to ▁be ▁a ▁good ▁nin ja , ▁like ▁Kan zo . ▁He ▁we ars ▁red ▁col oured ▁nin ja ▁ro bes . ▁Shin zo ▁seems ▁to ▁have ▁a ▁good ▁heart ▁and ▁st icks ▁to ▁being ▁loyal ▁to ▁his ▁brother ▁and ▁sometimes ▁gets ▁excited ▁when ▁others ▁are ▁excited . ▁Some ▁of ▁the ▁times , ▁Shin zo ▁tr icks ▁H att ori ▁to ▁giving ▁him ▁things . ▁He ▁is ▁also ▁known ▁to ▁cry ▁very ▁loud ly , ▁disturb ing ▁people ▁and ▁even ▁f ain ting