Part of our brand is the ninja star (in the following link), so feel free to incorporate into the design, although that is not required:
http://f.cl.ly/items/3C0T0Z1Y0e0b190I3f1I/ninja_star.png
We really like Uber's design, no so much for the feel but for the clean appearance and professionalism. Ours doesnt have to be as refined, it should bit a little more whimsical/adventurous while still retaining professionalism. We like the way Uber is both an Icon and the lettermark. Example here:
http://cl.ly/image/3r162M1Y0M32.
We are rebranding the site so optimal readability on mobile is a priority. We like both regular type faces and script fonts - so both serif and handwritten could be possible options for us - but please use only ONE type face. No combinations of two different fonts please. Whatever you think works best. Words should be one word, LiveNinja, horizontal - not vertical or stacked. When it comes to scripts, we like AirBnB's logo
http://www.pagerduty.com/assets/airbnb-logo-png.png, and also Obvious' logo
http://qph.is.quoracdn.net/main-qimg-1f206a8e16c5c9de50b437dd546ba5f7 but readability needs to be a lot better/clearer. Again, not hung up on Script styles but those are a few we like.
The Postmates logo is something we really like as well. Clean, professional, and fun:
http://cl.ly/image/1p0F1C0H263s
The logo should be readable when placed within a navbar with a 50px height on mobile. proper spacing and symmetry is incredibly important. Flat, clean, and simple styles preferred.
Thanks so much!!! Looking forward to seeing your designs. :)
-EDIT: We have opted to add some color to the design to give it personality. This green #92e07d, and a corresponding shade of Fuchsia, Blue, and Orange, that are in harmony with that green and also suitable for Flat design.