Gamer5 GTM +1 Morning, early afternoon (7-14 GTM)
Skythikon GTM +8 Morning, afternoon (around 16-24 GTM)
Metronome GTM -6 Early Morning, afternoon (around 1 GTM and 9-14 GTM)
Lucius GTM -6 Afternoon to Midnight (around 9-18 GTM)
Heat GTM -5 From 1-2 pm except weekends (around 7-20 GTM)
Tatsua GTM -8 Random Times
Ryonara GTM -6 Late Night (around 16-19 GTM)

Here are my guessing of when you are online and the rough transformation of such times into GTM equivalents. As it is now I would suggest this pairing:
Heat + Tatsua
Skythikon + Lucius & Ryonara
Gamer + Metronome