Alfrike is rather easy even on hard since, for some reason, her cubes reduce HP only by 8, and HP reduction is the most dangerous part of her attack imho. I also took Miki against her who 1) can silence her and 2) is immune to Mindless, so if he gets hit by cube it does not matter. The rest of my team was Vela, Heimdall, Sif and C-Vivica.
On the other hand the rest of Alfheim forest is incredibly annoying on hard, especially when you trigger burning or poison runes and multiple enemies trigger their bonuses. Some bosses can heal 300+ HP this way, and if the bonus triggers for flanks than it means potentially 600-900 HP healed. Ugh.