With 9 players, we can't really avoid overlap on arts, as long as concepts are clearly different we're good IMHO.
Here's my ideas, I'm open to suggesting of course.
Mechanically I'll probably adapt the concept I had there but with a different House. I'm considering a Criamon with the path of seeming, I might drop ignem in the process, but complete darkness is a fine way to deal with opponent in a "apt" way to use criamon terms. He's probably not the most esoteric Criamon, but he tries to live aptly which already is a challenge in the tribunal.
It will probably not be a native but his drive will be to make the tribunal more democratic and based on mutual assistance but he's also interested in the numerous mystical places of the tribunal as a way to advance in the understanding of the enigma (i don't have the tribunal book but from what I remember the structure was very loose and prone to violence and intimidation in the resolve of conflict, including raiding resources and such). He's probably attracted to this covenant in particular because he feels the site is worth of interest and should not be abandoned because of a mere accident.
So that's a gentle gifted magus focusing on In, Pe, Vi , Ig and probably a bit of mentem and imaginem.
Spells will maybe focus on detecting magic (sight of active magic), getting information (Summoning the distant image, Whispering Winds, Vision of Heat's Light...), darkness (well without light..), probably a cold damaging spell for self defense.
edit : I might also go for a Bjornaer magus or a Merenita with Nature Lore