[X] Giles doesn't do active magic (much), but he has a wide knowledge of various demons and their rituals, as well as a lot of experience. Buffy always feels more confident with Giles along, and he might be able to share some of the burden of watching out for the other two newbies.
[X] Jonathan Levinson has been working with illusions lately and is looking to prove himself in the field again after his scary encounter with Detective Stein.