I indeed collect Seviper. Just need three more cards to complete that collection. I also collect my favorite TCG artwork in PSA-10, NM ungraded, and sealed variations; English & Japanese exclusive FA Supporters; the full national index including forms and Shiny Pokémon; and I used to collect Mimikyu, but stopped with that. And non-Pokémon, I collect twisty puzzles; Yu-Gi-Oh rarities (TCG, OCG, Korean, misprints); and euro coins. Yeah ik, I collect too much. 
Currently my main focus is my Yu-Gi-Oh rarity collection. Simultaneously I keep up with releases for the FA Supporters, which is 100% complete right now. And I’m always on the lookout for the last few cards I need for my Seviper and Moltres collections.
Greetz,
Quuador