Idk more stuff about her.
Shes a weapon-born keronian who was essentially a test tube baby. Due to being made for the sole purpose of serving an army, she never had much of a childhood to begin with.
Being a weapon keronian, means that she must go through arduous training of the art of Staying Still for Long Periods of Time. Which is both difficult and extraneous, and causes her to be tired and sleepy for the most part. Such training includes having to endure several environmental changes, even harsh conditions, such as blizzards or the fiery heat of the sun with no clouds protectively overing over the people.
As a weapon she must be partnered with a handler. She has been through many handlers in the past, some were child soldiers, some were esteemed medics, some were frankly bad at handling her, some strict, some apathetic, some that didn't even notice that she is a keronian and just thought that shes just a syringe. Some thought that she was a regular keronian.
One of those, is Pururu (before she got appointed to chief medic). Who thought she was going to work with just a regular keronian. The two became friends due to their shared knowledge of medicinal artefacts. It was much later that Pururu found out that she can turn into a syringe,
(and with much amusement and glee asks her if she stabs people in the ass sometimes. Chushasha does not get it, but the mental image has made her, in the first time throughout her life- smile with much genuine glee, that she can't help but join in Pururu's strange antics.
She wonders if this is what real friendship is like.)
She sees no way out of the army, because she is literally a Part of it. But hopefully with the close relationship that she has with Pururu, and the lax permanently unfinished mission of the Keroro platoon- maybe shes seeing what it's like to just exist as is with no sole purpose in life. Nothing but shared blissful glee and enjoyment with a friend, and friends of a friend.