These bosses I've only fought once for the most part, but here goes:
-MapleStory: The Aran class gets unique boss fights as part of their story quests, and the ones that annoy me are...Well, all of them. The first boss has an attack that makes your character walk in a direction, and you can't act or heal until it wears off...Then there's his partner you fight later on, this bigarse dude who likes to use a magic spell that blows you back, so you have to keep walking over to him and hitting him...Oh, and both bosses have a seal spell that keeps you from using your skills, which is a problem since the Aran's main attack is a three-hit combo with the Attack key, which counts as a skill. So you're stuck using your slower normal attack until it wears off. There's also a crow boss you have to fight for your 3rd job promotion quest, and it does like 1200 damage with its attacks...Most monsters up to that point won't even break 700 or so, and Arans don't have a lot of HP (about 3000 or so at about level 70), so expect to use a lot of pots. Thankfully, he doesn't take too long to kill. Zakum gets an honorable mention, because it's a battle of endurance if you're tagging along just to get the Zakum Helm (pay a guild several million to kill Zakum while standing in the corner spamming pots). You CANNOT stop to take screenshots or use the bathroom or anything, because if you do, you die. Most Zakum Helm buyers have a Bishop to revive them in case they die, but they can only do it once (because of the long cooldown time). However, nothing will protect you if you disconnect, so having a good connection is a must too...AND NO TAKING SCREENSHOTS. It lags the game, and lag is not a good thing in a game like this. Sorry for the wall of text.
-Devil Summoner 2: White Rider...And I didn't fuse demons that absorb/null/repel death attacks. Not to mention the fiends can appear at ANY time after chapter 3, or any time PERIOD if you're on King Mode (not that I plan on doing that, I'm not a masochist).
-Pokemon HeartGold: I bought SoulSilver for my girlfriend a while back. Nice game, but the game's difficulty is piss-poor if you solo using your starter. Feraligatr FTW. Only problem is that Ice Fang is inaccurate when you least expect it, resulting in pain or death, especially at the later levels. I got through the game with relative ease, though I was a bit low on levels for Red (the gets a few more levels in this remake, making him the single most powerful non-Battle Frontier boss in any regular Pokemon RPG). So I decide to fight the revised Elite Four for some EXP...Boy, was that an uphill battle. I was stingy about using my PP items because you get so few of them (and with Pickup you only get a 5% chance at getting them). They were nothing compared to Red, though. The weather is set to Hail when you start, so you lose HP every turn unless you're an Ice-type. His Pikachu is an absolute beast, I had to use one of those attack-weakening berries to survive the first attack, and then I had to survive his Venusaur without getting killed...Blastoise was a freaking brick wall, followed by Snorlax (stupid meatshield), and then Lapras. OMG, Lapras. It has Psychic, so I was afraid if it lowered my Special Defense, I'd be a goner since I didn't have any X-stat items. Lapras also isn't affected by the Hail because it's part Ice, obviously. Once I got to Charizard, it was a sigh of relief since it's a Fire-type, and we all know Water > Fire. And all that for a lousy ribbon and a credits sequence I already saw. (sigh) Not much of a remake.
-Strange Journey: Finally, a game I have some enjoyment playing. The old-school aspect of the difficulty is nice, but I feel the game is still a bit archaic. Enemies tend to hit just a little too hard, having to find Forma to make any healing item that isn't a Medicine is a pain, and why are there so few MP healing items? What is this, Final Fantasy 1? I enjoy JRPGs, but after renting FFXIII and not worrying about healing after every battle, stopping to heal myself or hiking back to the nearest Terminal/Heal Spot while under the threat of being murdered by a sudden group of monsters feels like I should be doing something more productive, like advancing the plot or searching for that one demon or sidequest or whatever. I enjoy JRPGs, I really do, but Atlus seems like they're living in the past, I would at least like to be able to suspend my game without closing the DS, teleport between Terminals/the Red Sprite, and find items normally without having to run back and forge them. Also...CAN ATLUS PLEASE MAKE DEMONS RESPOND TO THE SAME ANSWERS CONSISTENTLY DURING TALKS?! A Hua Po responded differently to the same answer differently during two different conversations, then she has the nerve to turn around and suddenly NOT accept my offer to negotiate...What a bitch, I wish demons had abilities like in Devil Summoner 2 to make talks a lot smoother. This is like Noctune Lite, and I wish I had Nocturne. Then again, I like how you can pick your "class" at the start of the game and not worry about distributing points like in older games. I disliked that because I didn't know what I needed to survive through the game without looking at a guide, and even then it's a bit ambiguous. Still, I like Strange Journey, and I intend to beat it. Maybe more than once. =3