So, corner heroes are only hit with 2 columns of tiles, and AoE and 3-hitters are not very effective against them because they can only hit 1 target.
The downside of corner hero is that 5 columns are available for ghosting, so the attacker can easily spam special attacks. But the corner heroes are usually only problem when attacker doesn’t have good damagers left and probably has only healers/buffers, so those specials usually don’t do damage.
So, in order to be effective, corner heroes should have:
- Average mana or faster.
- Defense/elemental defence
- Good special and/or tile damage.
- Delay mana generation for enemies.
I’m omitting Mother North/Alberich here because their role is not to survive in the corner, but to resurrect entire team, so once they’re succeeded, they’re no longer the only heroes left in the corner.
So, apart from MLF (who fits almost perfectly) good candidates are heroes from second elemental link HotM (Zimkitha, Evelyn, Khiona, Onatel), because their elemental link heals them over time.
Vampiric-like heroes are also effective (Anzogh, Elkanen, Leonidas). Musashi isn’t very effective though.
Victor can be good though if attacker only has healers left.
Healers (especially heal over time): Ares, Tarlak, Rumpel, Ariel, Delilah, Guin, Red Hood. For 4* - Rigard, Kashhrek.
Good special damage with fast/very fast mana: Kage, GM, Obakan
Mana delayers: Mitsuko. 4*: Li Xiu