What of Tara? She seems to be a hot chick, but turns into a cold machine when you stop paying her ... (insert obvious girlfriend joke here).
Otherwise Mephisto ('spesh when he is in Aztec Demigod mode!)
Season 1 order
1. Mephisto (Mephisto number 1. come on!)
2. Rod Foxx
3. Steve Foxx
4. The Womp
Season 2.
1. Rod Foxx (has simply done more than Mephisto this time round)
2. Steve Foxx (Amped up the awesomeness)
3. Mephisto (has less of a role this time round)
4. The Womp (What the hell was with the antlers)
Therefore Overall using the power of Maths
1. Rod Foxx (2nd & 1st)
2. Mephisto (1st & 3rd)
3. Steve Foxx (3rd & 2nd)
4. The Womp (last and umm... last)
This said they all play an important role in the show and the show wouldn't be the same without them.
Tara is many times a better character than 'Tina T' though.