Since then, he and his best friend, Bob, have been hanging out with SMG4's Gang on multiple adventures. He is also one of the two biggest otakus (alongside Axol) of the gang, going so far as to hanging out with body pillows.
Much sought after in the past, Fishy Boopkins is naturally happy and optimistic, like his first appearance, where he was extremely happy to see humans, albeit by his sensuality. He is shown to enjoy playing with his toys, which implies that he is somewhat childish.
However, like Bob, he secretly craves attention and being noticed. This can be seen at the end of SM64: RETARDED RECAP 2016, where it does not explode any end to the name of its favorite brands, before being terminated by SMG4.
Boopkins is also implied to be a weeaboo because he keeps a huge collection of Dakimakuras and cardboard cutouts of anime girls, and considers them "waifus" (Japanese for wives), though most of these have since been burned by Saiko.
He also mentions that he watches school-themed anime, in SMG4: High School Mario. He is also a terrible singer, so bad in fact that him singing Bee Gee's "Staying Alive" caused the earth to explode, though this does not happen when he tries rapping in War Of The Fat Italians 2017.
He also eats rocks; it's implemented that he does this because he can not get food the natural way, but it does seem that he does enjoy rocks as seen in SMG4: Mario University, as he eats all of the large rocks his teacher gives him. This trait is shown in SMG4: Stupid Mario Sports Mix, in he eats bowling balls and believes that the bowling place is a buffet, much to Bob's confusion, In SMG4: Stupid Mario Paint, he is shown to be an outstanding painter.
When he is bullied by others, he has a tendency to call upon his dad to punish those who are being mean to him. However, he chose to get even with Mario himself after he was launched by a slingshot, though his friends assisted him with doing so.
However, he is known to be very stubborn and impulsive when he was eager to help Bob during the latter's concert in SMG4: The Mario Concert, but it ended up destroying and ruining the concert and led Bob to betray him and end their friendship.
Horrible Singing: Since this is mostly due to his mouth, Fishy Boopkins is an absolutely horrible singer in every aspect. His singing is so bad that, as shown in DerpTV: Mushroom Kingdom's Got Talent, it can actually cause the apocalypse and destroy the world.
Hobo Water Magic: Fishy Boopkins can also give humans the ability to breathe underwater in some way, and is distributed through his hands.
Dad Summoning: Fishy Boopkins can summon his dad, Joe Boopkins, when he is being made fun of or harmed to throw or destroy the people making fun of or harming Fishy Bookpins. This has been seen in multiple videos. Other times, Joe may be nice, such as getting people to places like Didney Worl or giving ice cream to his son for finishing homework.
Spike balls: Being a Spike, Fishy Boopkins is capable of extracting spiked balls from his mouth, though so far in episodes, he's only done this once in a segment from SSENMODNAR 12 - STOLEN SPAGHETTI EDITION on accident after getting sick from eating too many rocks (and one Magic Rock). In SMG4: Lord Of The Memes, one scene shows him, during his corrupt state of mind, with a pile of spiked balls next to him. He throws these off of a cliff to kill Mario & Luigi as they napped but Fishy's accuracy's so poor, the spiked balls hit every character passing on screen while leaving the Mario Bros. unscathed. It is unknown if Fishy actually regurgitated these spiked balls beforehand, so it's still currently up to speculation if he truly knows how to attack like a proper Spike.
Sonic Waves: In SMG4: The Super Dudes. Fishy Boopkins has the ability to make soundwaves at Wario and his minions.
Durability: Fishy Boopkins was able to survive having his kart launched into the sky when other racers were knocked out under similar assaults. He was also able to survive being launched by Mario's slingshot in Mario's Jackass, thought Fishy Boopkins hits the plane in enough speed, and Mario lands on Mushroom Kingdoom Mall only.
Giant Waifu Summoning: In Stupid Mario Tennis Aces, he was also able to summon a giant Waifu Body Pillow. It is strong enough to send Waluigi flying throughout the entire planet.
Excellent Artistry: While he usually draws low-grade drawings that are usually eye-searing, with huge motivation and dedication, as well as having a crayon expansion pack, he can paint high-quality drawings, sometimes able to make perfect imitations of the real deal, like the Mona Toadsworth painting. However, this would also cause his arm to be set on fire.
Alcohol Immunity: He has been shown to be unaffected by being submerged in what would be a lethal amount of vodka, though he was not shown drinking it; rather, he was immersed in it.
Self-Destruct: Boopkins' alternate self from SMG4: My Mario Academia has the ability to self-implode. As he states however, doing so would kill him.
Although Boopkins is a child, he has done his fair share of crimes over the years
Attempted theft of the American Declaration of Independence: In The Mario Channel: MARIOBUSTERS, Boopkins was challenged to steal the Declaration of Independence from a museum. Having no idea what he was doing though, Boopkins touched the glass dome, which caused security to try and arrest him. As a result, Boopkins ended up taking the Declaration and fled the museum, but while he was catching his breath, the police ran him over and arrested him.
Shipping: Due to the existence of shipping police officers who believe shipping to be a crime against humanity, poor Boopkins was a target for them.
Framing: When he was caught shipping himself with Miku, he framed Meggy for writing fanfiction in an attempt to get away.
Illegal Smuggling: During The Anime Arc, Boopkins along with Mario, became the newest member of The Anime Cartel, a criminal organization that smuggles anime into the Mushroom Kingdom following its banning. The charge was probably dropped after anime was unbanned.
On the Animal Channel of the Mushroom Kingdom, Fishy Boopkins was heavily mocked, being called "A Pathetic Piece of Aquatic Sh*t", a retard, and a "sh*thead" by the narrator.
Despite having a huge dislike for him, SMG4 gave Fishy Boopkins a thumbs-up in R64: Stupid Mario Kart (though this may be due to the presence of his dad, Joe Boopkins.). He also invited him to parties a couple of times but not Bob, possibly meaning SMG4 hates Fishy Boopkins much less than he does Bob.
He almost succeeded in stealing the Declaration Of Independence. though it hadn't been his intention to steal it.
Fishy Boopkins is apparently a grownup (debunked by himself in SMG4: Mario Preschool) as he said that he did not see land until he was a man. This could just have been a plan to sound like a badass, as he admitted as much.
However, he later says that he is a child in SMG4: Mario Preschool. Keep in mind that this still within the same year. His Mario Kart happens to be a stroller.
Despite being a child, Fishy Boopkins has used profanity, though this is rather rare.
Though he is normally friendly, stealing his Waifu body pillows or threatening his anime is basically a death wish.
As of SMG4: Doki Doki Mario Club, Fishy Boopkins now has a Super Mario 64 Mario mod, which is used alongside his Garry's Mod ragdoll in SMG4's more current videos.