Chainers and frames, get your chainers and frames here! (format here looks like shit but the format on reddit is very well done because you know, tables.)
https://www.reddit.com/r/FFBraveExvius/comments/6li4mx/best_4_base_chainer_discussion/
For a whole lot of us who was not graced by the god-tier 5* base chainers, we have to settle for chasing 4* base chainers instead. But would we consider the best at chaining?
A quick, incomplete summary below. I will try to consider the chain-pattern (to determine who chains best with each)
4* BASE CHAINERS
Unit Name Skill Name Damage Type ST or AOE Hits Modifier Element Frames
Agrias Holy Explosion 0/+1 Phy ST 5x 1.6x + Ignore DEF 50% None 70-10-10-10-10
Agrias Holy Explosion +2 Phy ST 7x 2 + Ignore DEF 50% None 70-7-5-7-7-7-7
Amelia Disorder Phy AOE 10 2x None 42-5-5-5-5-5-5-5-5-5
Ashe Sword of Kings Phy ST 7x 2.7x None 42-10-10-10-10-10-10
Ashe Heaven's Fury Mag AOE 10 2.3x + ignore SPR 25% + Curaja None 72-10-10-10-10-10-10-10-10-10
Chizuru Phantom Shadow Phy AOE 5 1.4x + 50% ignore def None 22-5-5-5-5
Rasler Patriotic Slash Phy ST 7x 3x Light 42-10-10-10-10-10-10
Rikku Burning Soul Phy ST 9x 2.3x Fire 40-25-25-25-25-25-25-25-25
Rikku Tidal Wave Phy ST 9x 2.3x Water 40-9-9-9-9-9-9-9-9
Rikku Winter Storm Phy ST 9x 2.3x Ice 40-13-13-13-13-13-13-13-13
Rikku Lightning Bolt Phy ST 9 x 2.3x Lightning 45-5-5-5-5-5-5-5-5
Setzer Prismatic Flash Phy AOE 7 1.8x None 42-5-5-5-5-5-5
Setzer Red Card Phy ST 10 3.2x None 40-3-3-3-3-3-3-3-3-3
CHAIN FRAMES Source - Thanks, /u/ToorimaAnchuu
Common Frame Unit Name Skill Name Frames
3s Setzer Red Card 40-3-3-3-3-3-3-3-3-3
5s Amelia Disorder 42-5-5-5-5-5-5-5-5-5
5s Chizuru Phantom Shadow 22-5-5-5-5
5s CG Sakura ??? 16-5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
5s Rikku Lightning Bolt 45-5-5-5-5-5-5-5-5
5s Setzer Prismatic Flash 42-5-5-5-5-5-5
5s Tidus Quick Hit 22-5-5-5-5-5-5-5-5-5-5-20
7s Ace Tri-Beam Laser +2 64-7-7-7-7-7-7
7s Agrias Holy Explosion +2 70-7-5-7-7-7-7
7s Dark Veritas Dark Guilt 70-7-5-7-7-7-7
7s Lorraine Gale Sword 2-7-7-7-7-7-7-7-7-7
7s Lorraine Lightning Storm 2-7-7-7-7-7-7-7
7s Onion Knight Elements 42-7-7-7-7-7-7-7-7-7-7-7-7
7s Onion Knight Onion Cutter 42-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7
7s Orlandeau Divine Ruination 70-7-5-7-7-7-7
8s Beatrix ? 12-8-8-8-8-8-8-8
8s Beatrix ?? 26-8-8-8-8-8-8-8
8s Eileen Piledriver +2 2-8-8-8-8-8-8
8s Lorraine Blde Prison 42-8-8-8-8-8-8-8-8-8
8s Nyx King's Sword 82-8-8-8-8-8-8-8
8s Trans Terra Chaos Wave +2 60-8-8-8-8-8-8-8-8-8
8s Vaan Assault Strike 22-8-8-8-8-8-8-8
9s Rikku Tidal Wave 40-9-9-9-9-9-9-9-9
10s Agrias Holy Explosion 0/+1 70-10-10-10-10
10s Ashe Heaven's Wrath 72-10-10-10-10-10-10-10-10-10
10s Ashe Sword of Kings 42-10-10-10-10-10-10
10s Rasler Patriotic Slash 42-10-10-10-10-10-10
10s Forren Sonic Blast 10-10-10-10-10-10-10
10s Randi Wave Slash 42-10-10-10-10-10-10-10-10-10
10s Reberta Mystic Thrust 42-10-10-10-10-10-10
10s Vargas Flare Raid+ 2-10-10-10-10
12s Rikku Water +2 133-12-12-12-12-12-12-12-12-12-12-12
12s Shantotto Tornado 80-12-12-12-12-12-12-12-12-12-12-12
13s Rikku Winter Storm 40-13-13-13-13-13-13-13-13
15s Eileen Piledriver 0/+1 2-15-15-15-15
20s T. Terra Chaos Wave 52-20-20-20-20
25s Rikku Burning Soul 40-25-25-25-25-25-25-25-25
Weird Gilgamesh Tri-Attack +2 42-4-6-4-6-4-6-4-6-4-6-4
Weird M. Fina Ultima +2 140-37-38-37-38-38-37
Weird Yun Raging Bird 38-3-2-3-4-2-4-2-3-2
TL;DR:
Common Frame Unit Names (future units/abilities)
5s Amelia, Chizuru, Rikku, Setzer, Tidus, CG Sakura
7s Ace (Enhanced), Agrias (Enhanced), Orlandeau, Dark Veritas, Lorraine, Onion Knight
8s Eileen (Enhanced), Beatrix, Lorraine, Nyx, T Terra (Enhanced), Vaan
10s Ashe, Rasler, Forren, Reberta, Vargas?, Agrias (Unenhanced)
12s Rikku, Shantotto awakened
Open for discussion, and will edit this as we go.
EDIT1: Added Rikku
EDIT2: Added CLuna --> then removed
EDIT3: This cover 4* base chainers at this time. Once Poorlandeau / Agrias comes with her upgrade, she'll be definitely up there as one of the best.
EDIT4: Added Rasler. Added chain frames and matching frames. Question: Will 5's and 10's still chain well (i.e. Amelia + Forren)? how about 5's and 15s 10's and 15s?
EDIT5: TONS OF FORMATTING (Learned how to make tables today!). Removed pros and cons, focused on chain frames now. Switched up Agrias base and enhanced Holy Explosion frames, corrected now. Added future units as well, because what the heck.
Hope this helps! Chain away!