Bosses other people seemed to have a hard time with that you beat pretty easily

For me,

Demise. I beat him on my third try..... Just used some Heart Potions and it wasn't that hard.

I have yet to face some bosses, like the Shadow Queen, so we'll see if I have a hard time with that.
 
Dark Star Core.
 
Yoshidude99 said:
The Shadow Queen and Dark Bowser.
People actually find Dark Bowser challenging?

Air Man in Mega Man 2.
 
Shadow Queen wasn't so bad. I only hate it when she charges up for that huge attack cause it forces me to use Veil and miss out on doing some valuable damage to her on Mario and Vivian's turn and then she would try to drain HP with her hands lol (I hate that attack too since it ignores defense so Power Lift isn't as effective)

Bonetail wasn't hard either, it's just that you're weakened from the other floors which can make it hard. Unless you get a Level Up on Floor 90. But whether or not I do, I tend to beat Bonetail without any difficulty. However, I have to be especially careful with Superguarding when he does his Ice Breath attack since it can freeze and Feeling Fine badges do not protect from those. Freezing is the only annoying thing I find about him though lol
 
yeah it'd be kinda hard to say what bosses are easy and hard for who since im sure most of us play games that are probably too different and completely different games that some people may have not played.
 
Only a mini-boss but Dark Link caused me no trouble first time playing.