Deadpan Snarker: But only in the dry, wry, whimsical, airy sense. This seems to be the sole reason he agreed to interview Panda.
The Gadfly: He loves making bizarre statements to mess with everyone, especially Penguin. Though never without playfulness or affection. He justifies this by saying he just wants to bring some fun into their lives.
Expansion Pack Past: He tells a touching story about his reasons for opening the cafe, and then Sasako brings up that he had told her a completely different version of events. He then shrugs and says both versions work. Penguin thinks he's making it all up.
Episode 26 reveals he had a brief hip-hop career and Grizzly may have been his DJ.
Evil Laugh: He doesn't laugh out loud much as an adult, but episode 25 reveals he had an absolutely chilling sinster chuckle as a cub.
Gentle Giant: Although he's accidentally stabbed Penguin at least three times because he's forgotten how long his claws really are, or did he?
Punny Name: As MC 469MA. Which spells "Shirokuma: Shi = 4 Ro = 6 Ku = 9"
The Stoic: His gentle demeanor never strays, even when he's making horrible puns or saying bizarre things to mess with his friends. Dare to say its unfair for him to charge for refills, though...
Not So Stoic: After Panda and Masaki decide to become Tree Kangaroo's apprentices. His eyes bulge out. When all his friends starts throwing puns back at him, he panics while becoming desperate for normal conversation and ends up running away from everybody.
Supreme Chef: Complete with organic vegetable, herb garden, in-house coffee and mozzarella artisans.
Waistcoat of Style: Starting from volume 3 of the manga Shirokuma almost always wears a black bistro-style waistcoat at work instead of his usual blue scarf. In the anime he wears it for one episode, and then is back to his blue scarf for the next.
Attention Whore: Panda occasionally strays into this as it seems like his ever-changing whims seems to revolve around how much attention people pay to him. Ironically, he loathes Rin-rin, who would lavish that kind of attention on him.
Case in point: When the gang go to the beach, Panda revels in being adored by a group of old ladies. But when Shirokuma attracts a flock of younger people admiring him, Panda's expression quickly darkens, his ears take on the shape of devil horns, and he yells for Shirokuma to set up their camp already.
Big Eater: He's so obsessed with bamboo that he wondered if a bamboo-scented shampoo was suitable for eating.
Can't Hold His Liquor: One sip of Irish coffee is enough to knock him out. It just makes him tipsy in the manga, however.
It's All About Me: The nice but incredibly naive and self-absorbed version. He usually means well, but he's the happiest when everything in life catered to his whims.
He gets depressed and attempts to run away from home because his mother said because of her busy schedule, his birthday is being consolidated with his brothers, so he would have to receive his birthday presents a month late. He takes this as his mother favoring his little brothers and sister over him.
Lack of Empathy: Most of the time. Only in three occasions so far does he show sincere, non-ambiguous concern for his friends.
Took a Level in Jerkass: Compared to his manga counterpart, Panda is much more rude and thoughtless to his friends and peers.
Just to give one example of many, in episode 22 Panda was generally rude to the Pygoscelis penguins, showed no interest in their cards, and called their Memory game boring, but in the manga Panda was much nicer to them and continued to play their Memory game rather than dismiss it.
Took a Level in Kindness: In episode 28, he feels genuinely bad about Shirokuma having a brush with the law because of his laziness. To the point that he sincerely works hard at the Cafe the next day, minus a few hiccups.
He's also heartbroken at learning that the zoo transferred Full-Time Panda to Singapore as they had been close, despite Panda's eccentric remarks. To the point he literally works himself to exhaustion.
Bruiser with a Soft Center: Though a certified and genuine tough guy, Grizzly has his moments of sweetness. He is absolutely heartbroken in episode 16 when he believes Shirokuma is dead, causing him to tearfully reminisce about him and Shirokuma playing as cubs. Also in the same episode he grows fond of a fox bartender's children, even becoming their "uncle".
Made much more obvious when he was a teenager and getting flustered over a female grizzly he had a crush on.
Butt Monkey: Used to be one when hanging out with Shirokuma in their childhood.
Dark Is Not Evil: He's basically the dark mirror of Shirokuma, with black fur, a more agressive personality, a less diurnal schedule and leather. Yet he's still a mostly decent person and sometimes the voice of reason when hanging out with Panda.
Ascended Extra: Llama only appears a tiny handful of times throughout the entire manga. Compared to that, Llama is considerably more prominent in the anime, to the point where he's practically part of the main gang.
Put on a Bus: The zoo transferred him to Singapore. He had Handa and Kirino not tell Panda until after the fact and tried to spend as much time with Panda as possible until the day came. He sends Panda postcards from time to time.
The Bus Came Back: He returns whilst on holiday with his family in Episode 50 for one heartwarming reunion with Panda and everyone else.
Loony Fan: The guy is gaga for pandas to an almost scary degree. Mr. Full-Time Panda seems to be the sole exception to his obsession. When he first admits his affections towards Panda, he gives off such a "Creepy Stalker" vibe that it is really uncomfortable to sit through.
Love Martyr: Willing to do anything for Panda, who's creeped out by his advances.
Pet the Dog: He actually provides Panda with sensible advice to make up with his mother after he eats her tulips.