This post replaces a previous one I posted (now deleted), that had a crappy photo.
Sometimes adults from Porterhouse College or bots with special talents accompany the adventuring company to provide support:
Here we have Captain Ironside, Grim Ben and Tiberius 'Tinker' Bullshott:

Captain Ironside:
Once a promising officer, Ironside was invalided out of the Army after almost losing his leg to a Dervish sword. Ironside now teaches at Porterhouse, trains the school cadet force and is mentor to the adventuring company. Despite his wound, Ironside has become proficient in the martial art Bartitsu .
Grim Ben:
Grim Ben was captured by a mad scientist as a subject to perform experiments on. Rescued by the adventuring company, he recovered but at the cost of having to live with hideously deformed skin, making it impossible for him to return to a normal life in public. After petitioning by the adventuring company, the school took Ben in as a caretaker. Ben now takes care of both the school building and the boys of the company when out 'adventuring'. As a result of the experiments performed on him, Ben is now a lot harder to kill than ordinary men. His preferred weapon is a heavy club.
Tiberius 'Tinker' Bullshott:
A younger son of the famous manufacturing family, Bullshott was sent to Porterhouse following an incident involving an exploding dovecote. His family hoped that sending him to an out of the way boarding school would keep him out of trouble. This may have been a mistake! Young Bullshott has found new uses for his natural engineering talents in support of the adventuring company.