Okay, so I didn't have enough idea's for Dirge personally so just view this as a general overview on "Conehead Seekers" and how they're different really...

• They have a "megatooth" at the front of their mouths, which is just their front dental units merged to create one big 'beak' tooth.
• Coneheads are very proud of their 'beak' and do not like people mocking it. Though they can peck you pretty hard with it haha.
• Just like other seekers they use their wings to emote.
• Dirge used to work on an Energon farm and kinda wishes for the old days back.
• Their wing-tails have a couple of joints on them, this goes towards emoting and to help them sit and move about in places their tail would get in the way.
• Coneheads are more prone to chirping than other seekers.
• Yes, they too can move on all fours and hop like a birdy.
• Oh wait, I do have one idea regarding the characters: Dirge is probably that guy who is comically unlucky.