Lets be fair here, many people consider this film to be very forgettable, lack lustering and awful as it's a rip-off of movies like Madagascar, Finding Nemo and The Lion King by copying each of their stories.
I'll go with the characters:
(First) Samson the Lion: The father to Ryan, he is a wannabe version of Mufasa, is super shallow and mean-spirited to his son not being able to roar and for losing to a game of curling. He also lacks any charm or positive traits.
(Second) Nigel the Koala: He is also a rip off of King Julien as he's introduced by lame slapstick and most of the time, he's simply there to provide unfunny nut gags, slapstick and lame one-liners... Much like most of the characters in this film. One of the worst jokes is where he's wearing a popcorn bucket around his waist, and he says 'Do I look trashy in this?'. And not to mention he is super annoying especially with the dolls of him with their voice boxes exclaiming ''I'm so cuddly, I like you''.
(Third) Benny the Squirrel: He has a horrible accent and his crush on Bridgette the Giraffe is considered creepy due to their different sizes. Not to mention, he's pretty much a nuisance throughout the movie.
(Fourth) Bridgette the Giraffe: She is nothing but annoying and unfunny, not to mention her and Benny's relationship is still considered creepy due to their different sizes. She's pretty much a rip-off of the gender equivalent to Melman who is a male.
(Fifth) Larry the Snake: An obnoxious and stupid character who fails at being funny and all he says throughout the film is 'OKAY' is very annoying.
(Sixth) Ryan: He's surely a rip-off to Nemo and Young Simba without the charm and likability he has compared to them. He also fails to roar when having this annoying cat meow.
(Seventh) Kazar the Wildebeest: The main villain of this horrendous movie is considered to be Disney's most boring, uninteresting and stupid villains yet. His plan to get his fellow wildebeests to join him in 'going up the food-chain' by eating all the predators they can find makes no sense at all. And also his minions are badly-written as well.
The worst part of this movie has got to be the ending song 'I'm having a really nice day, really nice day, really nice day', yep, this is considered Disney's most horrible song of a movie with all of the characters in it, and that's why they have to count as they are not seen as extensions to the film.