

Extremely energetic — He rarely just sits around. If there's something happening, he's probably already running toward it. Recklessly curious — If he sees something mysterious, his first thought is basically “I wonder what happens if I touch that.” This explains… a LOT of his deaths. Fearless… sometimes too fearless — Explosions, rockets, dangerous inventions, space travel? His response is usually “LET'S GO!” Friendly — He genuinely likes being around the other Silly’s and tends to drag them into his adventures. Impulsive — He acts first and thinks later. Sometimes he doesn't even get to the “think later” part. Inventive — He loves making things, especially ridiculous inventions like Balloon Boat and the Crazy Train. Determined — When he decides he's going somewhere or doing something, he REALLY commits to it. Easily distracted — Something can completely derail whatever he was doing.
Very energetic — He talks like he's constantly excited about whatever he's doing. Fast-paced — When something exciting happens, his words can come out almost faster than his brain. High-to-medium pitch — His voice has that energetic puppy-like quality rather than sounding deep or serious. Lots of emotion — He can go from excited → terrified → confused → excited again in about two seconds. Exaggerated reactions — He doesn't calmly say “Oh, that's concerning.” It's more like “WHAT IS THAT?!?!” Casual wording — He doesn't usually sound sophisticated. He says what's immediately on his mind. Occasional weird noises — Especially because his voice is based partly on the monkey/R sound technique you described. He can yell REALLY loudly when he's excited or panicking.
To adventure the universe