Some of the bosses have hard to remember names so I started giving some of them nicknames (plus there's a few others I like to give nicknames) like:
Gwanada: G Wanda
Dark Agrahni: Dark Angry
Dekor Maryuda: Decor Malinda
Nove Marydahl: Nove Malinda
Bryu Ringahda: Blue Ring
Nove Ringahdarl: Red Ring/Not Rico/Nove Ring
Apos Dorios: Apostle Doritos
Apostol Torissha: Apostle Doritos Spicy Nacho/Apostle Tortilla
Kodotta Idihta: Coata Idea.
Baretta Idihta: Barely [an] Idea
Falz Daril: Falz Darrel
Falz Dranble: Falz Duorumble (the English patch name was something close to this)
Banser Donna: Pantherina
Banser Ong: [can't think of a good one]
Dal Malri: [can't think of a good one]
Banser Elna: Panther Elsa
Banser Oran: The not actually orange panther
Catredran: [My] Cat Ran
Catre Drahl: Crater Draal
Catredransa: [I can't think of a good one x.x]
Quartz Dragon: Not Rera
Goron Zran: [Just shortened to Goron or Goron Zan]
Zran Grahl: naZ noroG/noroG
Noire Drahl: Ow the Edgedragon
Chrome Dragon: Not Hadred
Haze Drahl: Shadow the HedgeDragon
Tranmizer: Metal Gear Rex Zero
Tranzexia: Diet Metal Gear Rex
Big Varder: Big Vader
King Varder: Emperor Vader
Vardersoma: Vader's Persona
Embryo Varder: Egg Vader
Orgbran: [i've got nothing for this one too]
Orgceratos: Orgceratops
Bar Lodos: Die[t] Rol Le
Bar Dominus: Bartholomew
Biol Meduna: Be All Melinda
Magisa Meduna: Magus Melinda
Nept Casadohra: Neptune Casanova
Casado Badoohl: Casanova Badool
Leomaduraad: Tiger Mallard (and yes I am aware mallards are ducks)
Malduzareed: Mallard Zeed
Anjadeurili: Wanyudo Zero
Yogjadeurili: Diet Wanyudo
Gigur Gunnegam: Gigur Gun (or just Gigur, these aren't all winners)
Gunne Ginnegam: [Enter the] Gungin
Gwahl Jigmolde: Gwa Jigoba (I swear I've heard Sitch from Lilo and Sitch say "jigoba" which inspired this but it doesn't appear to be part of his language?)
Agata Jigmolinde: Agito Jig
Magatsu: The Attack on Titan raid.
Tagamikazuchi: Thunder spirit
Izanekazuchi: Gold thunder spirit
Viel Hyunal: Veal Hunar
Dio Hyunal: Itwasmedio
Anga Phandaj: Anga Funrage (based on the fan translation)