Lourima Viiran

Planeswalker - Lourima [M]
[+X]: You Lose X Life.
[0]: Sacrifice a permanent. If you do, add to your mana pool an amount of equal to the sacrificed permanent's converted mana cost and you may activate another Loyalty ability of Lourima Viiran this turn as though this ability had not been activated this turn.
[-X]: Draw X Cards.
[1]

(I feel like her starting loyalty is as much a matter of flavor as of balance. If I could figure out a convenient way to start her at 0 I might.)

Lourima's Spite

Sorcery [R]
Each opponent loses 1 life for each in your mana pool.
"Die."

(It's an Exsanguinate that forgoes returning you life in favor of letting you keep the .)

Lourima's Grasp

Sorcery [U]
Choose one - Target player loses 2 life; or target creature gets -2/-2 until end of turn
Choose one - You gain 2 life; or target creature gets +2/+2 until end of turn

(Mix and match Consume Strength and Syphon Life.)

Lourima's Shade

Creature - Shade [C]
Intimidate
, pay 1 life: Lourima's Shade gets +2/+2 until end of turn.
0/1

(Balancing this versus Looming Shade was hard. 1 power less and a more difficult to splash cost alone was NOT worth gaining Intimidate, so it got the life cost added to its pump.)

Denner Fabellian, the Delver -
Planeswalker - Denner
Whenever you draw a card, you may put a loyalty counter on ~
[-3]: Name a card. Search your library for a card of that name, reveal it, then shuffle your library and put that card on top of it.
[-8]: You gain an emblem with "You may play cards from your graveyard as though they were in your hand."
{4}

Denner's Recollection -
Enchantment (R)
Whenever you cast a spell, if you cast it from your hand, you may put a spell counter on ~.
, , remove a spell counter from ~: Return target card from your graveyard to hand.

Denner's Search -
Sorcery (U)
Search your library for a creature, artifact or land card. Shuffle your library, then put the card on top of it.

Denner's Muse -
Creature - Human Advisor (C)
When ~ enters the battlefield, choose one - draw a card; or, return a card from your graveyard to the top of your library.
1/1

Daneera the Huntress –
Planeswalker – Daneera (M)
[+1]: Add to your mana pool. Use this mana only to cast creature spells.
[0]: Daneera deals damage to target creature equal to the number of loyalty counters on ~. That creature deals damage equal to its power to ~.
[-2]: Put a 3/3 green beast creature token onto the battlefield with “When this creature dies, remove a loyalty counter from Daneera the Huntress."
[-6]: Reveal the top ten cards of your library. Choose a creature card from among them and put in onto the battlefield. Then choose up to two more creature cards from among them and put them into your hand. Put the rest on the bottom of your library in any order.
{4}

Daneera’s Devotion –
Enchantment (R)
Whenever you tap a forest for mana, put a charge counter on ~.
Whenever a forest is put into a graveyard from the battlefield, put two charge counters on ~.
Remove two charge counters from ~: Add to your mana pool.

Daneera’s Baloth –
Creature – Beast (U)
Trample
Whenever ~ deals combat damage to a player, you may untap it.
4/4

Daneera’s Call –
Instant (C)
Put a 3/3 green beast creature token onto the battlefield.

I am also a fan of Beryl for , even if she is a R/W walker. The main problem is differentiating her from Chandra mechanically, but that's a hurdle we can jump over later.

Besides that, however, we have relatively few Red planeswalkers that could fit in her - which I believe Is a discussion that already took place somewhere. I did however, see someone post something about a Red gunslinger from Jakkard. I was under the impression it needed some work, though.

I'm actually interested in the idea of a mono-red Beryl, but with a focus on the "Small Magic" more than the fire. Something like:

Beryl, Enchantress
Planeswalker - Beryl
[+1]: Discard a card. If you do, reveal cards from the top of your library until you reveal an Enchantment card. Put that card into your hand, then shuffle your library.
[-2]: Add to your mana pool. Use this mana only to cast enchantment spells.
[-5]: For each enchantment you control, Beryl deals 3 damage to target player, and each creature that player controls.
{3}

Just put "red" and "enchantments" into a gatherer search and you'd clearly see how little red interacts with enchantments.
You can't make arguments that such-and-such doesn't break a pie because a single card exists.
I could just as easily point to Aura Barbs and say red hates on enchantments.