Demonic Spiders / Dissidia Final Fantasy: Opera Omnia

• Bats and to a much bigger extent Galuf Manikins which can all sharply raise their dodge. The bats balance this out by having low health and attack and lose the buff if they are afflicted with a BRV Break (which can usually be accomplished with one shot from Sazh's Aim attack), but the Galuf Manikins don't suffer from this drawback and can sometimes border on Boss in Mook's Clothing.
• Floating Eye enemies can be annoying since they come with a Counter-Attack that can paralyze you, which their normal HP Attack also has a chance of doing. In addition, since they are flying enemies they are resistant to melee attacks, so the typical heavy hitters of the game such as Cloud, Squall, and Tidus may end up just shy of taking one out with a melee combo, and get smacked with the paralysis status effect. Their more stronger counterparts, the Evil Eyes, instead actually have the ability known as Cursed Lullaby which can debuff the targeted character with a MAX Bravery decrease if they aren't immune to the said debuff beforehand.
• Lamia are this if you have a party consisting of mostly male party members, as they have an attack called Entice which is basically an improved form of paralysis (it not only stuns your male party member, but also gives Lamia a good chunk of BRV when said party member's turn gets skipped). Lamia are also pretty fast and it's not unusual for them to get the first action before you can even attack them. The obvious Achilles' Heel of this attack is that it doesn't work on female party members, but as mentioned above, many of the most popular party members to use (Cloud, Squall, Vaan, etc.) are male.
• Malboros and any variation of them tend to inflict extremely nasty debuffs across the whole party; if you can somehow provide a chance of debuff evasion with specific party members or somehow prevent them from having their turn, your life will be so much easier.
• Warrior of Light Manikins also become this in a way. When fighting many Manikins, his Shining Shield isn't threatening, since he can only put it on one enemy at a time. If he's the only enemy left? Have fun gaining no BRV and dealing with unpunishable HP attacks!
• Laguna Manikins can be extremely annoying if not taken out fast, as they can launch a Grenade to attack your entire party and lower your entire party's SPD. The latter of this can be especially annoying if a Laguna Manikin is encountered early in a multi-stage battle, as that lowered speed can mean every one of your enemies the next round may get a free hit on you before you can even take an action. Don't forget the lowered defense debuff on that either, meaning you will also effectively take more damage for that same duration.
• Lenna Manikins can easily be a pain due to their debuff evasion, and their healing. The one in Eald'narche's boss fight proved that much.
• Penelo Manikins are probably the most hated form of this, as they will use her LD ability to Total Party Kill everyone if they ever get a turn and the only way to survive it is with massive amounts of damage mitigation or some way of preventing her from doing any damage to the party: since her LD ability cures the enemy's debuffs, any debuffs that reduce HP damage dealt by that enemy don't work and you need to rely on party buffs that let them avoid or nullify all damage done to the party.
• This may range towards bosses that were originally final bosses in some forms of content (such as earlier Lost Chapters) that will eventually reappear as common mid-wave bosses. Though depending on the contexts involved (party composition, current power curve era and boss in question), what may end up as a massive struggle for earlier players instead ends up as a mere annoyance.