▁Street . ▁ ▁Y o yo ▁( per formed ▁by ▁Y ves ▁Brun ier )   – ▁He ▁is ▁a ▁fear ful , ▁hyper em ot ional , ▁and ▁very ▁anxious ▁mon ster . ▁ ▁Y o yo ▁has ▁a ▁heart ▁of ▁gold ▁and ▁his ▁qual ities ▁are ▁very ▁ende aring . ▁He ▁is ▁a ▁live - hand ▁variation ▁of ▁Nar f ▁from ▁Ses ame ▁Street . ▁ ▁O live ▁( per formed ▁by ▁Charlie ▁B az ire )   – ▁A ▁green ▁fur ry ▁mon ster . ▁N aught y , ▁fear less , ▁full ▁of ▁gig g les ▁and ▁gr ins : ▁O live ▁is ▁all ▁that ▁at ▁once ! ▁She ▁has ▁a ▁similar ▁design ▁to ▁that ▁of ▁Kar ina ▁the ▁B aller ina ▁from ▁Ses ame ▁Street . ▁ ▁El mo ▁( per formed ▁by ▁Christ ophe ▁Albert ini )   – ▁Three - and - a - half ▁years ▁old , ▁he ▁is ▁the ▁young est ▁character ▁in ▁the ▁series . ▁Origin ally ▁from ▁the ▁American ▁version . ▁ ▁Georges ▁( per formed ▁by ▁Richard ▁Sand ra )   – ▁Georges ▁is ▁a ▁p engu in ▁who ▁arrived ▁on ▁R ue ▁S és ame ▁inside ▁an ▁ice ▁cube . ▁A ▁like able ▁character , ▁he ▁made ▁friends ▁with ▁the ▁rest ▁of ▁the ▁R ue ' s ▁residents . ▁ ▁Hum ans ▁ ▁Tit ou an ▁( port rayed ▁by ▁Flor ent ▁Mor ini ere )   – ▁A ▁retired ▁man , ▁he ▁is ▁considered ▁to ▁be ▁a ▁" true