Samus Aran -from Metroid

You never get to see this side of her, but as someone who works alone, she must be her own engineer and technician. Making repairs to her ship and armor and designing new systems for them... she must be pretty knowledgeable in the sciences as well. No one thinks about how intelligent she must be in order to be an effective bounty hunter, but considering that she was raised by one of the most technologically advanced civilizations known, it's obvious. That quality makes her even more amazing. <3