Easiest character

[stinkysiam]

Who would be the easiest character for a beginign player. I personally like eli but i want to know who i should tell my brother to use because he is new and pretty bad

[Liy4b-Derg]

If you're willing to sacrifice the rhythm for ease and practice, Bard should be the easiest one.
Otherwise it would be Cadence for me. It's always ideal to start with the normal gameplay, so when you have to use other characters you just need to learn a bit more about their starting items (and mechanics) before being able to play well.

It's worth noting that each failure in roguelike games is a valuable lesson, and learning how to deal with different kinds of enemies is very important.

[Helly]

Bard > Melody > Diamond > Cadence for easiness, but the easier it is the less actual good practice you get, thus the harder other characters are comparatively.

[CarThief]

Personally i'd order them from easiest to hardest as... Bard > Nocturne (DLC) > Diamond (DLC), Candence > Melody. These are kinda the normal ones. The rest kinda being mainly challange characters.

I mean, Nocturne is basically Candence with a bat-form to recover health with (and it's a good way to break open crates/barrels since it does 3DMG), and holding the BEST weapon type in the game, the Cutlass.
If you strike anything with the Cutlass (which has a range of two), you're immune to just about any standard enemy attack for that beat you struck in, making any attack that hits you get parried. (Exceptions being, uh, explosions, dragonfire, hot coals, and other area-of-effect stuff like Spores or the Yeti's attack. Oddly enough, you can parry the Ogre's club with it, too.)
Parrying stuff litterally lets you facetank a dragon by repeatedly attacking it from above/below. It's rediculous. The standard cutlass can carry you from zone 1 to 5!

Diamond is just great for being able to move/attack in all 8 directions, something most enemies cannot do. A huge advantadge. Even better for them is the item pool being reduced (since they cannot use a lot of weapons or spells and other items to compensate), meaning it's FAR more likely to find something like a Rapier or Cutlass and go nuts (or other weapons with 2+ range).

And Bard just makes this game turn-based, giving you infinite thinking time. This is kinda overkill, but picking Bard can be helpful to learn enemy patterns or play with Bard as P2 to cheese the story of that character as you control both in a turn-based fashion on the same keyboard, if it is too hard by default. (Worked wonders for me by having Aria as P1, Bard as P2.)

So uh, i'd recommend Candence, if that's too hard, try Nocturne (if you have the DLC). If that still doesn't work, maybe have them practice with Bard before trying again as someone that isn't Bard. This is a tough game, you learn by dying and failing.