It's not likely your username will come up in speech,* but it's fun to think about. Mine is fairly obvious because it's phonetic.
GAN-tik
Stresses, in CAPS, are assumed to be American unless otherwise noted by users in the thread. Some usernames aren't stressed because they're unknown. Pronunciation table will be included later.
Mine's pretty self explanatory; StormWalker. No funny pronunciation in there. Storm, as in storm, and then Walker, as in walker. It's not like StoormWhaylkeer, or SuhtuhooruhemWuhahelckehruh.
Ernie-one-five. The numbers one and five are significant as separate numbers, not as one number. Those who have read it as "fifteen" have been incorrect in mental pronunciation.
I am the guy who taught Cenere how to pronounce his own name, so I basically own this thread.
But for mine, the A is pronounced as in "car", the TH is pronounced as a T, as in "rat", and the stress is on the A. I would write the pronounciation, but I'd probably get it wrong.
JACKinbigletters. Jack (The name) in (As in "to put something in a box" big (Like large) letters (Those things in the alphabet.) Jack-in-big-letters.
Apparently, I've been putting the stress on the wrong syllable for Moegreche.
I'll be updating the OP with pronunciations. It would help if it's indicated which syllable is stressed in CAPS.
To help, using the word Capital. Pretend the CAPS is louder or more pronounced:
KAP-i-tl
kap-I-tl
kap-i-TL
The ones that sounds more right is the one that's more properly stressed.
Longer usernames or multi-word usernames might have multiple stresses.
LAWNG-er YOO-zer-naymz or MUHL-tee-werd YOO-zer-naymz mahyt hav MUHL-tuh-puhl STRES-iz.
Different dialects stress differently. If my examples sound weird, it's because you're using a different dialect of English. American pronunciation usually stress the first syllable for two-syllable words.
My username is pronounced Min-oh-tar. It's not pronounced Myno-tar or Myno-tor (I've heard a few of my british friends say Myno-tar or - Myno-tor). The fifty five part is silent.