For manga and light novels, rates are generally determined by the publishers, so negotiation is difficult
For translators, $5/page for manga and $10/page for light novels are the lower end of market rate, but rates vary from $1-$9/page or $1000-$1500/vol (manga) and $6-$15/page (LNs)
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Simulpubs (simultaneous publications) usually (and should be) paid at a higher rate because they often involve fast turnarounds or weekend work. They're in the $7-$9/page end for manga
Some translators have also managed to negotiate non-simulpub for rates above $10/page, but this is rare
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Raises with experience are also rare. I know of two companies that give retention raises for translators who continue to work with them. Some publishers have given inflation raises, but these are also rare and are not annual, so freelancer pay has been mostly stagnant overall
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