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Strength
After the protagonist boarded the oil freighter which is actually Strength, they faced its Stand user, a giant monkey. It is highly intelligent and demonstrate human-like behaviours, such as smoking cigarettes, solving Rubik's cube and lusting over the young girl Anne while she's showering. It was a formidable foe as it is able to phase through the ship and even managed to restrain Jotaro. However, Jotaro managed to defeat it, after freeing himself by provoking it and extended his "Star Finger" to launch a coat button into its head.
D'Arby the Gambler
On the last hand of poker against D'Arby, Jotaro refused to see his hand, nor exchange his cards. D'Arby was about to call Jotaro after he bet his remaining "soul chips", but Jotaro interrupts by also betting the souls of Kakyoin and Avdol. Right after hearing this raise of ante, in exchange for information about Dio's stand; D'Arby had a mental breakdown, causing him to admit defeat in his heart and lose the gamble.
Justice
Enya the Hag controls Justice, a terrifying stand that is made of a cloud of fog. It can control anybody by tying strings of fog into their open wounds. Since it is a fog, it is also basically impervious to physical attacks. Justice was ultimately defeated when Jotaro uses Star Platinum's agility and power to disperse Justice before it can reform itself.
Alessi
Alessi is one of the Egypt 9 Glory Gods, controlling Sethan who can reduce the age of those who touches the shadowy Stand, even to the point of becoming a fetus.
It also de-ages the target's Stand, making it weaker and less potent.
At the climax of the battle, he managed to de-age Jotaro into a little boy and weaken his Stand.
However, he was ultimately defeated when he underestimated Jotaro's weakened Stand, which was still comparatively powerful.
Egypt 9 Glory Gods
After defeating the 15 Stand users whose stands are named based on tarot cards, we learn about the existences of a group of elite Stand users serving Dio, known as the Egypt 9 Glory Gods. Our protagonists then encounter and fight each member of the Egypt 9 Glory Gods, giving us some memorable match-ups such as Iggy against Petshop; Joseph and Avdol against Mariah; and Jotaro, Joseph and Kakyoin against Terence T. D'Arby.
Stand Names
Before stand names are mostly named after music references, in their debut in part 3 Stardust Crusaders, they are all named after either tarot cards (for the earlier appearing stands of both protagonists and antagonists), or Egyptian gods (for the enemy stands of the Egypt 9 Glory Gods that appear after our protagonists arrive at Egypt).