Demon Slayer and Cannoneer are currently the only two to have Level 2 Link Skill, asides from Kanna. The rest will get their level 2s in Unlimited.
Cannoneer: Pirate Blessing
Level 1 - 15-all, 5% hp/mp
Level 2 - 25-all, 10% hp/mp
Demon Slayer: Fury Unleashed
Level 1 - 10% boss
Level 2 - 15% boss
Level 1 - 5% total damage
Level 2 - 10% total damage
They're all unlocked at level 120.
It's arguable that Jett's core is also maxed at level 120, I wouldn't expect that one to ever get a level 2 since it already levels up in its own way.
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