Valhalla Saga

Its amazing that this novel got a manhwa. Honest this is one of the best series I have read and I highly recommend it. Later as the story progress the mc gets a harem of Valkiries later plus some other races much to everyone's amazement and Odin's and the MC is highly respected by this feat alone and they give him funny nicknames, but the top girl is undisputed!! and it gets better with the war and so on. Its based on the war of Valhalla VS the other realms to avoid Ragnarok and deal with the evil giants. The MC powers are that he can use his game character from the game he was playing and he has templates based on the character level. At the start he can only summon and integrate with his character at level 10... but as the story progresses he can use his character at max level and even go further. He summons both his character abilities and equipment plus inventory

I highly recommend you go read the novel. You can find it easily in the internet, its in a lot of sites. But you can check novelupdates if its easier.