Cookie - In general I think they would get on, however I think at times there could be a bit of tension between them. Friends but not very close perhaps?

Cian - I am up for anything here, however Modesty isn't without house prejudices so there could be an issue there.

Magda - I agree here, get along well enough to share a room but not really that friendly.

Tanya - Should stay away, Modesty wouldn't like her, far too strange and Ravenclawish.

James - I am pretty sure Modesty would have no issues with James and I think an ex-snog idea is good, however it would have had to have happened before Modesty and Sirius started whatever it is that they have (needs to talk to J more about this).

Isabella - These two could be friends, people who talk with each other in classes, or somehting. Possibly not that close, they might be too similar to really get along.

Our deepst fear is not that we are inadequate
It is that we are powerful beyond measure

As we wind on down the road
Our shadows taller than our soul