 If you liked
Erementar Gerad
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 ...then you might like
Dragon Crisis!
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Both have male/human protagonists with a female 'friend's (Dragon in Dragon Crisis!, Edel raid in Elemental Gelade)
Both have female 'friend's who are able to powerup the male character
Both have a certain word/chant they say before powering-up (pardon the crude word)
Differences:
Elemental Gelade is where the female friend becomes a weapon, and the world is filled with people who can do that, while (for now) only the male protagonist has the ability in Dragon Crisis.
Elemental Gelade uses a unique chant where both the human and female has to say in sync, while (for now) both Ryuji and Rose say 'Engage'