There are so many wonderful and entertaining dynamics where Scar gets to be as chaotic as he pleases while the other person yells at him in disbelief. Funny man ー Straight man (also knows as boke-tsukkomi, for weebs like I am) is a proven comedy duo formula that works, and works well.
Which is why it upsets me when people try to push Cub and Scar in this box. Because Cub presents you with a dynamic that hasn't been explored before: what if you thought everything Scar Goodtimes does was fucking awesome. What if you were completely down to get into any and all trouble with him without a single question asked.
What if Hotguy were the sexiest man alive. Well, he is, obviously, and Cub is gonna collect all merch of him that exists, and give him a dedicated corner in the museum, and outbid everyone for the Hotguy painting auction. Because Hotguy just makes him feel a special sort of way, you see.
What if the magic crystals were actually real. And they are. They possess secret, powerful capabilities no one can begin to understand. They bend time and space. You should totally visit the wizard in the jungle and buy everything in stock. Cub did that and Cub absolutely does not regret it.
Scar wants to abuse his authority as the POE, blowing up all shops that he deems unworthy? He should do that. Here are some TNT blocks.
Scar wants to burn down the s11 map, despite the hard work of the firefighters? He should do that. Here is a flint and steel.
I can keep going for eternity. Cub loves crazy. Cub IS crazy, he is Scar's wonderful mad scientist friend who he is a little scared of. Just because he knows how hard Cub can go. Every hermit knows how hard Cub can go. Cleo thinks Cub is the scariest hermit (despite being able to handle him herself pretty well). Doc, despite his evil theatrics, doesn't dare to mess with Cub. Cub can destroy entire Minecraft ecosystems in seconds just because he thought it would be funny. He is not no-nonsence, he is all nonsence.
And he loves his friends so much! Including Scar, especially Scar! He is an incredibly involved hermit who is always ready to help people and participate in community projects. He often laughs at Scar's jokes when no one else does. He always treats Scar with respect, seeing him as an incredible strong and capable individual. And he gets so, so worried when there is even a tiny implication that Scar might actually be in trouble.
TL;DR: Cubfan135 is the silliest man alive who is deeply enamored with everything Scar does and you should treat him as such