Suggestions for magical powers and abilities!

As Miriam is an Alchemist and inflicted with the cursed crystals I wouldn't mind seeing some transmutation-style magics. Perhaps it's as simple as turning a patch of floor into a temporary shield that crumbles away after a few hits, letting you negate the projectile weapon of a nasty ranged foe. Or a more utilitarian spell for early on in the game...extending & powering up your weapon with a crystalline shell around it in the shape of the weapon itself. Temporary buffs to help the player overcome a particularly challenging section have always appealed to me. 

Enemy summoning, but Im talking about big and vicious enemies like a zombie dragon or maybe a defeated boss to aid you.

A lot of individual spells could work. One example would be erupting a flame on the other end of the room and teleporting into the flame for travel. Another could be summoning crystal stalagmites in a line to deal special elemental damage.

That was something that I was actually quite fond of in Order of Ecclesia; I liked that Shanoa's weapons had a magic gauge which made players think before acting when attacking. If I recall correctly, I think the first time IGA did this was with Portrait of Ruin wherein...

Maybe adding something to the effect of Doppelganger ability which allowed for multiple sets. Also possibly renaming it to something that would reflect the stained glass idea that this game is using.

How about I give some ideas for names, and you guys give them shape?

Azure Inferno
Snowflake Bomb
Crystal Mirror
Hellscreamer

And, as already revealed, Miriam can get Gunvolt's Voltaic Chains.

My pipe dream for this game is for it to be the PoR successor we never got, but instead of standing still while charging you could control the direction of the spells with the right analog stick while still having control of Miriam with the d-pad. I haven't really thought out the mechanics to make such a system happen, but I'd love to see the game go that direction. On more realistic grounds, given that the game will more then likely have crystals as some sort of modifier, I think it would be interesting if we saw a return of HoD spellbook modifiers, except this time for weapons, critical arts (ones that are much more expanded on then what was seen in DoS and PoR) and item crashes. Whether the crystals will have an effect on your entire equipment set or must be applied individually will probably depend if they actually want players to have to level up towards their own unique build, rather then just equipping whatever suits their situation best. 

Speaking of laming it out, this is a bit off topic but having healing items that heal over a period of time rather then instantly and/or not being able to pause the game in order to change equipment would easily address a couple of the complaints I had with previous titles  

Should we expect the Right Analog Stick to be used for camera controls in an Igavania-style game such as Bloodstained?

I do agree though, using that for extra slots is an ingenious idea, especially for Spells.