Regarding Trigedasleng, 'my' and 'I' are both represented by 'Ai', does that mean 'we' and 'our' would be represented by the same pronoun (and what would that be)? Since an important phrase we've heard has been 'my fight is over'/'Ai gonplei ste odon' , I'm curious how that phrase might be expressed if it were 'our fight is never over'.

Well, that depends on which "we" you want. There are two in Trigedasleng: osir and oso. The first one is used when you want to include the person you're talking to in the "we" (called an inclusive first person plural pronoun), and the second is used when you want to exclude the person you're talking to in the we (called an exclusive first person plural pronoun). This is a distinction not currently made in English, but it is made in other languages like Hawaiian. I'll let you decide which "our" is more appropriate to your phrase. Just using one at random...

Oso gonplei nou ste odon nowe.

That's how I'd do "Our fight is never over" just off the top of my head.