In the New Teen Titans comics by Marv Wolfman and George Perez, Beast Boy had the limit of only being able to transform into non-sentient animals he was aware of existing. This limit was established, so Beast Boy couldn't use his powers to replicate sentient species from other worlds, like Kryptonians or Martians.
Titans only showed Beast Boy shapeshifting into two animals - into a tiger and a snake. However, this ability of his is much more complex in the comics. In the comic books, the Beast Boy can shapeshift into any animal he chooses.
Beast Boy / Changeling (Gar Logan) can most typically shapeshift into any beast, meaning any non-sentient creature in the animal kingdom. As such, no, he couldn't become a sentient force of any kind. He does not need to have seen the animal before, just know of its existence. No, he cannot shapeshift into other people.
It's been known that Beast Boy is going to turn into a giant starfish much like Starro the Conqueror to stop the Necrostar. It's also been known that he'd similarly use spores that would transform hero and villain alike into fearsome creatures due to Beast Boy's unique animal powers.
Why Can Beast Boy Only Turn Into Animals? (Young Justice)
Can Beast Boy turn into anything other than a tiger?
Beast Boy has the ability to morph and transform into any animal that he has seen himself or has seen in an illustration (as is the case when he shapeshifts into an animal such as an extinct dinosaur).
Beast Boy is capable of morphing into any type of animal, so long as he has seen what it looks like. It's not like this detail really matters all that much, considering Gar need only look at an illustration of a creature to be able to transform into it.
Yes, as Beast Boy has the capability of turning into any existing or extinct animal. Though I do think he is most skilled at remaining a chordate, he can become an arthropod at will.
For example, in his original battle with the Justice League, the team's obligatory, useless sidekick Snapper Carr saves the day because his quicklime-covered body proves immune to Starro's powers.
He chooses an animal based on the situation he's in. One unique feature, though, is that he doesn't have to be just one. If he chooses to turn into insects, he can become an entire swarm of bugs like bees or fireflies.
He has changed into multiple animals such as a swarm of fireflies and a group of barnacles. The only problem is no matter what form he takes the animal's skin and hair color will always be green. Beast Boy can also change into a hybrid, which has all the animals' powers rolled into one.
Beast Boy is a shapeshifter who can transform into animals and other beings (aliens, mythological, fictional). His DNA completely changes when he transforms.
Beast Boy's most recent transformation makes his entire arsenal of the animal kingdom pale in comparison. His Garro transformation is his most powerful to date. However, this form is ever too powerful for Beast Boy to control.
Beast Boy doesn't have this limitation, as he rewrites his DNA at the cellular level to actually transform into a green version of whatever creature he wants to be. He can become as small as an amoeba or, as his battle with Titano in Titans proved, as large as a building.
Why can Beast Boy only turn into a tiger in Titans?
"It took me a while to figure it out." As to why he, thus far, only transforms into a (green) tiger, "He thinks it's psychological. Tigers have always been my favorite, ever since I was a kid." That explains the green paw patch on his jacket, too.
During an argument about what pizza toppings to get, Beast Boy explains he doesn't eat meat because he's been most of the animals that would go on the plate. He has been a chicken, and presumably a bull when fighting supervillains. Training would also involve him shapeshifting into various ones.
Beast Boy (real name Garfield Logan) is a member of The Team. He grew up on an animal sanctuary in Qurac, with his mother. After an accident Miss Martian was forced to give him a blood transfusion which resulted in him gaining the ability to shape-shift into any animal.
Komodithrax (コモディスラックス, Komodisurakkusu?) is a giant mutated komodo dragon kaiju that appeared in the Godzilla: The Series episode "End of the Line", whom also is Godzilla's mate.
Therianthropy: Beast Boy can transform into any animal he has ever seen, including a dragon. Animal Mimicry: By transforming Beast Boy gains the abilities of the animal, including a dragon's Flight and Flame Breath.
In the 1998 film Godzilla, the monster is referred to as a male and is depicted laying eggs through parthenogenesis. In the Legendary Godzilla films, Godzilla is referred to as a male. Godzilla's allegiance and motivations have changed from film to film to suit the needs of the story.
Season 4 has made it clear that Beast Boy has arrived and that Gar has access to all his powers. This has been shown by having him transform into one fan-favorite animal -- a gorilla. Beast Boy's path through Titans hasn't been easy or simple.
