Helga confesses her love to Arnold's answering machine in the episode entitled "Helga Blabs it All."
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Giroro has yet to confess his love to Natsumi. In episode 4, he technically proclaims his love for her, but this is in his mind. It is obvious to all of the other characters besides Natsumi, which works to Keroro's advantage when trying to get Giroro to comply with nonsensical missions.
We don't know for sure that Kashino is in love with Ichigo, but there have been sightings in the anime that he blushes when he is around her, and at the last episode of the preview of the first season, it showed them holding hands. In Wikipedia, it states that Kashino does have feelings for Ichigo. ~Other User~ Of course! If you see Yumeiro Patissiere Episode 11, he admits that he loves Ichigo. In Episode 13, he goes ahead and tries to confess to Ichigo! If you haven't already watched it, there's your proof! (:
Episode 191 shipunden
She gives him the kiss of life in chapter 663.
Season Five|Episode Eight Barely Legal