Accents are made by your native tongues way to pronounce letters. As well known example in modern day german there is no TH sound so germans pronounce it like S or Z as this is the closest sound they know from their native tongue.

So as Paarthurnax suggested this would likely be a dovahzul accent. And...accents always sound kinda strange and ridicolous thats normal

Maybe? For me I cant speak deep so I dont know how I would do that but that sounds kinda cool. Ill just be speaking in a higher pitch I guess.

I try to speak Dovahzul in a lower register as well. Not everyone is going to be able to do that though, so I wouldn't consider that to be the "accent" part of Dovahzul. I'd say a Dovahzul "accent" might feature the following:

• Exaggerated plosive consonants (b, d, g, p, t, k). "G" always hard.
• Long vowels. "I will not run" in a Dovahzul accent might be pronounced like "ee wheel note rune."
• Possible blurring of "l" and "r." In the above example "run" might sound closer "loon" than "rune."

All just hypothetical.

Late as: alduin, paarthurnax, Odahviing and durhneirviir all tinvaak in dovahzul 

I'm gonna sound ridiculous while speaking in Dovahzul accent XD but for now I'm gonna rule out the deep voice thing.