So judging by these diaries, Mac is Bill McDonagh. Aaaaannnd I just imagined Mac with Bill's accent.
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Big Macintosh Audio Diary: Freezing Pipes
Redheart, ah know Medical Pavillon is yer manor, but yall might want t cogitate on this: ocean water is colda than ah dragons tit. Ya don't heat tha pipes, tha pipes freeze. Pipes freeze, pipes burst. Then Rapture leaks. Now, ah realize yer ah posh sort o geezer, an frankly, ah don't give ah toss if yall piss o go fishin. Bu once Rapture starts leaking, tha ol gal's neva gonna stop. And then ahll be sure t tell mah Sis she's got yall t thank.
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Big Macintosh Audio Diary: Rapture Changing
Rapture's changin, but mah sis can't see tha wolves in th woods. This pinkamena feller… she's turned into ah crook an ah propa tea leaf, but she's got the ADAM, and that makes her th guv'nor. she's sinkin tha profits back into bigger an bettr Plasmids, buildin them Pinkie Poorhouses… mo like Pinkie recruiting centrs… bfore we know it, th nut-jobs gonna have an army o splicer ponies, and we're gonna have ourselves ah whole heap o miseries.
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Big Macintosh Audio Diary: Eden Leaking
If things weren't bad enough, it seems that evn our water system's sprung ah leak. Eeyep, that's right. Tha irrigation system in Arcadia is takin on seawater. Ah told Mah sis when we were building this place; either ya build er like ah bathtub, o she's gonna turn into ah sewer. "Nah, Mac," she said, "we aint gonna build no bathtub… we're gonna build Eden."
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Big Macintosh Audio Diary: Becoming the General Contractor
Ah became tha Genral Contractr fer mah sis the day me an tha lads were installin tha bathroom plumbin up in her posh Park Avenue digs. 'Hey!' says she, 'what's with all tha brass fittins? Genral contractr had meh down fer th tin.' 'Well,' ah says, 'ah supposed it's tha contractr then who'll be bailing out yer loo once a fortnight, aint it? If it's price yall a worried bout, ah'll be pickin up th brass, so not t worry, squire.' 'An why would yall be doin that,' says she? 'Well, sis, profit r not, no pony bails water out o privies built by Big Macintosh.' The next day ah finds out, ahm mah sis new genral contractr.
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Big Macintosh Audio Diary: Arresting Pinkamena
Applejack, sis, ah believe in Rapture. But that dont mean we always win. Pinkie Futuristics is tha biggest thin goin in Rapture. So let meh be plain: when we arrest tha nut-job Pinkamena fer her thieving and smugglin, we mus make it clear that we won't touch her business interests. We sit on tha Councl cause these poor ponies trust us… not cause Celestia an Luna gave us ah chair.
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Big Macintosh Audio Diary: Seeing Ghosts
Seems like some po ponies ave started seein ghosts. Ghosts! Sis tells meh it's ah side effect o this Plasmid business. One po pony's memries getting passed on t another through genetic samplin. Leaks. Lunatics. Rebellion. And now bleedin ghosts. Ain't life in Rapture grand?
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Big Macintosh Audio Diary: Pinkamena's Army
pinkamena knew our ponies wer comin. We wer done ova. Them splicer ponies come screamin out th woodwork. Burpin fire, spittin ice… demons out o pony hell they were. Neva seen nothin like it. It wasn't ah business she was buildin, it was an army.
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Big Macintosh Audio Diary: Guns Blazing
Tha good ponies o Rapture didn't sign up t see us govnrment-types shuttin down shops, killin their owners… even with ah lunatic like Pinkamena. But she brung it upon erself. 'Stead of coppin it on th chin, buggr gets into her head that she's gonna go down guns blazin. Who does she think she is? John bloody Mane? We can get on top o this. We can. Here's what we do: we find Pinkamena's will and make what was hers go t where it was intendd — and not into tha pockets of us tha put 'er into th ground.
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Big Macintosh Audio Diary: Pinkamena's Legacy
Strikes meh that Pinkamena wasn't overly incnvenienced by er own demise. On New Year's Eve, her wretched splicer ponies came streamin out o th poor houses an stormed tha proverbial barricades! Tha dead rot in th streets, and citizens ah lined up round th block fer Plasmids… anythin t help fend off th rabble.
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Big Macintosh Audio Diary: Genetic Arms Race
Ah begged mah sis t hand Pinkie Futuristics over t Pinkamenas' ponies as ah peace offerin, but mah stupid sis won't listen t reason. 'Stead she's just splicing her mob up, givin em more an tougher Plasmids. There's an arms race on here in Rapture, but it's not bout who can build tha best guns and th biggest bombs. It's bout who can become less of ah pony and mo of ah monster…
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Big Macintosh Audio Diary: Applejack Takes Pinkie Futuristics
Sis nationlized Pinkie Futuristics — she owns it now, lock, stock an barrel. Fer tha good o th city, she says. She'll break it up in due time, she says. Ah've resigned from th Council an lodged meh letter o protest, but that's just pissin in th wind. It'll be war, ah say… unless somepony stops mah sis and right fast.
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Big Macintosh Audio Diary: Stopping Applejack
ahve nevr killed ah pony, let alone ah membr o mah own famly . But this is what things ave come to. ah don't know if killing mah sis will stop th war, but ah know it won't stop while that mare breathes. Ahm on mah way ta see Pinkamena t make amends with er. Ahm gonna need er help fer this. Ah love mah sis more than anythin else, But ah love Rapture. If ah have t kill one t save th other, so be it. Ah just hope that Pinkamena will let meh make amends, an help meh out