Jubei is a fighter on the mission and overall deals in brute force. He may not look it, but this cat is one of the strongest living beings on his planet and ranks high 3 to low 4 on the scale. The only thing that really holds him back from higher is that he doesn't really have any special powers and is more or less normal for his species. He does have a special eye that can do some cool stuff, but won't use it on this mission because it could damage things in such a closed off environment and also because the canon doesn't quite confirm what it can do, so I don't want to accidentally contradict myself for later if we get more info...
But outside of brute force, he can also use a pair of Kodachi blades and they apparently have the power to cut something that normally can't be cut, like magical barriers for example. Not sure how that how that would help exactly, but needless to say if he slices at the monster it should do some damage considering they're not very "conventional". In Blazblue it's called a Nox Nyctores, which is the strongest level of weaponry in the canon and were created to fight the Black Beast. Just think of the Black Beast as a giant Eldritch monster thing - Jubei won't even be surprised by how this thing looks.
He also has quick speed as part of his cat reflexes and small size. While he will be focused on attacking, if he sees someone in danger he'll quickly break out of it to help them too.
So tl;dr, lots of brute strength, with some rough technique + special weapon that can cut things that aren't usually able to be cut + speedy cat.
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But outside of brute force, he can also use a pair of Kodachi blades and they apparently have the power to cut something that normally can't be cut, like magical barriers for example. Not sure how that how that would help exactly, but needless to say if he slices at the monster it should do some damage considering they're not very "conventional". In Blazblue it's called a Nox Nyctores, which is the strongest level of weaponry in the canon and were created to fight the Black Beast. Just think of the Black Beast as a giant Eldritch monster thing - Jubei won't even be surprised by how this thing looks.
He also has quick speed as part of his cat reflexes and small size. While he will be focused on attacking, if he sees someone in danger he'll quickly break out of it to help them too.
So tl;dr, lots of brute strength, with some rough technique + special weapon that can cut things that aren't usually able to be cut + speedy cat.