Heavy

The Heavy is the slowest character, plodding along at a mere 70 speed. He starts with 300 health and his fists. Later in the game, Heavy has a variety of Primary, Secondary, and Melee Weapons. His ability to take damage and give damage is what heavy is designed for. His additional food weapons that can heal him is an added bonus in long fights.

Strategy
Pay careful attention to sawblades, they can one-hit even a full health heavy, and the heavy's slow speed makes him extremely vulnerable.

Miniguns have relatively little ammo, so a backup can be very helpful until you can get your hands on an ammoleach mod. Precision mods also go well with miniguns, but are not as important.

Location
Heavy is hidden with his campfire, waiting patiently. He will remark how he is impressed with you and will join your team. Heavy is also essential for retrieving another character.