system
Given the following post, respond as if you're commenting on Reddit:
human
[Teen Titans] Can Beast Boy alter select parts of his body without altering others?

Like, if the TV remote is out of reach and he's too lazy to get up for it(which given his behavior isn't too out of line for him), could he just turn only his arm into an octopus tentacle or something?
gpt
Probably not, but maybe?

Traditionally, Beast Boy's powerset has been to transform into an animal (and gain the corresponding animal's abilities/ characteristics + ability to speak). Partial transformations are outside his toolkit, so no, he can't typically sprout an octopus tentacle to grab a remote across the room.

That said... Occasionally there are hints that Beast Boy's powers are not yet fully developed. Most of the time when we see him in action are either as a teenager or young man. On rare occasions, either when Beast Boy's mind has been affected or when we are presented with a future version, he has demonstrated transformations and abilities that the younger/normal version lacks (specifically, turning into a Lovecraft blob monster and splitting into multiple animals). So it's not out of the question that he might develop such an ability (partial transformation) as he ages and develops his powers, but it's not a certain thing.