Take Maine accent, mix with a tinge of stereotypical British, add a bit of Transatlantic, mix well, then top it off with some Boston and some thick Maine accents and boom, base Axolotlian, then add some Dutch accent and some other random accents, now you have Axolotlian accent in the North.
In the south you would take the northern accent and add a tiny touch of Southern American, but just a tiny touch, a noticeable but not overwhelming amount of classic Caribbean accents and then a small amount of Australian.
To get the Arada accent you simple take both North and South and mix them, before adjusting everything slightly, just enough to make it noticeably evolved for the heat.
Bray and Limerwhisk share the Northern accent but with even more Maine, and a bit of Scottish.