Fun Fact: If the Warden and Marauder skins have a midlaner, they are complete teams.
Team Warden:
• Top:
• Jungle: 
• Mid: ???
• AD Carry:
• Supporter: 
Team Marauder:
• Top:
• Jungle: 
• Mid: ???
• AD Carry:
• Supporter: 
Of course it could be sorted otherwise, but I'm sure my champion-role-placement is correct if you remember how the skins have been released:
The first "wave" contains a Jungler and an ADC:
http://vignette2.wikia.nocookie.net/leagueoflegends/images/f/fc/Sivir_WardenSkin.jpg
http://vignette3.wikia.nocookie.net/leagueoflegends/images/7/73/Warwick_MarauderSkin.jpg
(When released, Warwick was mostly known as jungler and rarely known as toplaner. I therefore assumed his role as jungler.)
The second "wave" contains a Toplaner and a Supporter:
http://vignette2.wikia.nocookie.net/leagueoflegends/images/c/c0/Jax_WardenSkin.jpg
http://vignette2.wikia.nocookie.net/leagueoflegends/images/e/e5/Alistar_MarauderSkin.jpg
Question for you: Which champion fits best to lead the Wardens/Marauders?

......... idk tho,
would look pretty badass
?

and karma can then go mid while jax goes jungle with naut support. OR warden




Warden?