Ophelia

If I were you I would be tempted to merge once because she'll gain atk on the first merge, and the third copy I would fodder. ot saying that it's what I would actually do, but I would definitely consider it.

The thing is that in order to buff her atk via merges you need to merge her twice as merges look at the highest 2 stats when the unit was at base level working it’s way down ladder and then repeating itself. It does not look at final value to determine buffing. Amongst her neutral stats hp is the highest followed by speed @ 9, res @ 8 atk @7 and finally def @5. In order for atk to maybe come before Spd in being upped off just one merge, You would need a Spd bane and an atk boon. On that note an atk boon is totally worth targeting for as it’s a super boon that takes her up to 41 before looking at the weapon or unit skills.