Hidden Ability (HTFA Series)

In Happy Tree Friends Adventures series, some of the playable characters have a hidden ability that makes them different from each other, thus giving some advantages or disadvantages to a level. Usually, characters like Cuddles are known to be well-rounded, but some others have different abilities. These abilities can be seen clearly starting from the second or third sequel.

Fast Runner
A tree friend having this ability can run fast and jump over long gaps. However, the tree friend will be difficult to control on small platforms. Giggles and Petunia both have this ability.

High Jumper
A tree friend having this ability can jump higher than other tree friends lacking this ability. The tree friend might have difficulty avoiding ceiling traps though. Flaky (possibly) has this ability.

Total Disadvantage
A tree friend having this ability is a slow runner as well as a low jumper. Only Nutty has this ability.

Fast Swimmer
A tree friend having this ability can swim faster, but runs slower on land. Only Toothy has this ability.

Extra Power
As of HTFA 6 onwards, some characters have this ability despite being well-rounded in movement. A tree friend having this ability will give bigger damage to enemies if he/she uses his/her special power. This ability also makes certain characters' special power hits multiple opponents on 3 ways. Two hidden characters from HTFA 6 have this ability. It is possible that Flippy might have this ability as well, as his appearance as a playable character in an upcoming HTFA spinoff short playthrough preview shows him firing his gun on 3 ways.