The Gate is a sentient being and is literally the gate that the goddesses (among other beings) use for travelling between worlds - on Earth, she looks like a young girl. From people who travel through her, she gathers information that even surpasses the knowledge of the goddesses. But when Peorth is recalled to heaven concerning an urgent matter, she can't return because the Gate went on strike. Summoned by the goddesses, the Gate appears at the temple and wants to have first hand experience on real life, emotions, and specifically, romantic relationships (we later find out that's why she came to Keiichi and Belldandy - their story has made its way even to her.) She sometimes feels alone on her ancient duty of letting people travel through her and wants to overcome that by experiencing love from Keiichi - unaware of the complexities of relationships and honest love. After some more incidents (and one of Belldandy's jealousy storms) the Gate begins to understand what Keiichi and Belldandy's relationship is all about - and that loving someone is not as easy as she thought - and returns to her duty. (from http://ohmygoddess.wikia.com/wiki/Gate)
Ludwig's Father, the King is mostly a comic relief due to his arguments with his son Ludwig and his fear of his dear wife, queen Almaberga. He is very, very terrified of his wife. She loves to tease(torture) him. In fact he was so afraid of his wife, the spell that was cast upon him broke because of his terror.
He is the elder of the Geltic tribe The Elder believed that it was his son who had created the secret society of Geltic descendants and who was after the treasure but it was in fact Jean Pierre, his professor who had killed him. When Jean Pierre is holding Lara hostage and attempts to flee, The Elder shoots him in his "T" zone.
Weary from rebuilding the Hellsing Organization's army from the Valentine Brothers' attack, as well as being dismissed from a vampire attack by MI-5 (and bothered by an ominous premonition from Alucard), Sir Integra Wingates Hellsing received a surprise visit from Laura, her sister living in the Essex area. The visit was friendly but soon unusual events were occurring: Seras Victoria was being restrained by Walter, Alucard has his first encounter with the masochistic vampire Incognito, and Integra herself was unusually fatigued. She then realized all too late the sad truth – she was an only child, and the woman claming to be her sister was in fact a vampiric assassin. "Laura Hellsing" is in reality a Baobhan Sith – a Celtic vampire often referred to as "the White Woman". Baobhan Sith often wear long green gowns, and have been known to use hypnotism to ensnare its victims. This particular one had stabbed Integra in the stomach before drawing her blood... then Alucard (because of Incognito's boasting) realized what was happening, interrupted and slew the beast before Integra was killed. And as a result, Walter was released from the enchantment that forced him to restrain Seras and both raced to Integra's aid. However, because she was bitten, Integra nearly kills herself by stabbing herself in the neck to draw out the creature's taint from her body. She was later saved in a hastily-arranged operation by Dr. Trevelyan soon afterward. (source: Absolute Anime)