On grammatical class:

ja'onai
discursive/evidential: after all...
ji'acu'i
discursive: continuing/extending/belaboring the point
ji'anai
discursive: returning to or correcting a previous point, moving back in the conversation/discourse
ju'aku'i
evidential: although, even though, while, whilst
oi se'i bu'o oi se'i bu'o
oopservative attitudinal: "Oops, I did it again!"
po'onai
discursive: not exclusively, among others, including but not limited to.
va'icu'i
discursive: in the same words.
zo'oro'u
Attitudinal: innuendo/sexual wordplay marker (the "sexy ;) " emoji).