Kumoko - powerful magical healing but no medical training, brute forces her way through making people healthy. Doesn't spend time in medical, but does produce the basic supply of medicinal potions. Very unreliable for emergencies.

Lightning - relatively average magical healing, futuristic first aid training, spent a lot of time with wen qing and still tends to hang around medical. ICly willing to be on-call for injuries or to show people how to use the healing manadrives.

Generally I'd recommend having a rota or a 'who's around, who's got what speciality' rather than trying to establish a leader, since they're not a faction, they're a skill group.