It’s all katakana, as @lilikoi said.The font is kind of stylized, though, so that’s probably why you’re having trouble finding the characters on katakana tables.
Using romaji the syllables would be Ku-ri-su-to-fu-a. So your fourth character is to, pronounced like the English toe. The sixth character is a, pronounced like ahh.
Japanese generally don’t write foreigners’ names with kanji. I suppose you can find kanji whose pronunciations are close to what you’re looking for, but it would probably just confuse readers.
For example, my name is Nick. In Japanese katakana I write it as Ni-ku. Now, there are words in Japanese that are pronounced as niku, such as the word for meat. But I don’t use the kanji for meat when I write my name because 1) I don’t want to be associated with meat (lol) and 2) it’s kind of confusing to do that.
Hope that helps some.