Greetings, Piri!
No one at EuroFURence - or at most other Furry Conventions - will be hating on you, just for being an MLP fan (or "Brony"). We've had several MLP-FiM themed fursuits over the years, and they participate in the fursuit parade and walk around the halls of the con site like everyone else. LOTS of Furry Fans are also MLP Fans, as well as being general fans of Animation, Comic Books, and Music Performance and Production.
...(one note about differences of approach: Ive noticed on such fan sites as Equestria Daily that bronies tend to do CosPlay in clothing (mostly dresses and gowns as appropriate) geared to accommodate the human form and comfort; while I haven't seen anyone CosPlaying as Princess Celestia or Princess Luna in that particular style at any furcons I've attended, I have seen many people CosPlaying Anime and Manga characters, and even Pirates of the Caribbean or Beetlejuice, with no hassle)...
So by all means, feel free to sign up for a membership when registration opens, and be prepared to have a fun time! Just be open-minded to the fact that most of the programming and fan participation won't have an MLP slant to it, but no one is going to make you feel uncomfortable for your pony interests, or for bringing them up.
...OH - and if anyone does make you feel uncomfortable or you feel harassment or hostility for any reason - a very rare occurance, in my experience - well, we have an excellent Security Staff to make sure that it stops, pronto! Just let any of them know (they wander continuously through the convention space, and have a central base and telephone access), or any staff member know, and it will be dealt with.
Good Luck, and hope to see you at EuroFURence sometime in the future!
