I've been playing Gypsy before and I managed to get some tricks.
When battling a champ, if you have Gypsy Harp, try using Jupitel Thunder to push him away. If he's on GTB, swap your accessory to a Marine Sphere Card, which does Magnum Break..It will push them away. If they use GTB, you can be on a good advantage, because that means that they are not wearing reduce damage card[usakoring]. If they have RSX on, their armor would be weaker, so with your AV, you might be able to kill him/her. If none works..Get 2 OL and wear Alice Card, and then Am mut card. Reflect=Death...Since they wanted to kill you so much, it looks like the only choice you got is to Reflect, which would annoy them. BTW, get Valkyrie Manteau +10 for more reflect. They should die, and then they would eventually stop because they would think it's useless to keep on suiciding xD