Leo Siever

"...Don't you mean 'we'?" (Leo reveals his Mach Driver and the Signal Chaser) "Why the hell do you have that?" "Because I'm a LEAF agent now, just like you! (sotto voice) Don't worry, I'm just as confused as you are."

- Leo and the player character, before donning the Chaser armor for the first time Leo Siever is a supporting character in Plants vs. Zombies: Infinite Generation. He is introduced as a fellow coworker of the player character at Cosmic Compiler until the EXA incident leads to the latter's reassignment, but disappears from the story shortly afterwards, only known to be continuing work for Compiler in a custom G-Stream.

Leo later returns when the World of Heroes establishes contact with the prime universe, having also joined up with LEAF, and is given a Mach Driver and the Signal Chaser to transform his G-Stream into Armored Rider Chaser.

Origins
Leo is a Gravitree, and is thus based on the Malus genus of trees, also known as apple trees. His last name Siever is based on the Malus sieversii, a Kazakhstani species of apple tree that is known to be one of the ancestors for domesticated apples.

Personality
Leo is a cool-headed, amiable individual, talking with a casual tone in all of his appearances. Even as Chaser, which introduces him to the harsh reality of war, he tries to not let the suddenly-much-higher stakes get to him, working with his peers for the common goal of ending the reignited conflicts.

A recurring habit of Leo is that he is constantly out of the loop to some extent: he is not informed about the EXA incident until after the player is reassigned, he returns late into the first campaign, he is given the Mach Driver and Signal Chaser without knowing much about why he in particular was chosen (though such a decision was equally baffling to many other LEAF commanders), and he is unaware that the Dead Liberation exists until some time after the player resolves the events of the first campaign.

Gameplay
As a story NPC, Leo does not have a vendor inventory, but interacts with the player through dialogue and actions when he appears.

In Combat
As Chaser, Leo does not behave similarly to any specific class configuration in combat, instead simply using the Chaser armor's beam halberd to land extremely powerful blows on enemies.

Leo may also emit a distortion field through the particle accelerator on his G-Stream's back, suppressing weaker enemies and disrupting stronger ones.

G-Stream
Leo pilots a slightly-modified G-Stream, a mass-produced model developed by Cosmic Compiler. Leo's personal G-Stream, painted purple, has the single antenna fin on its head removed and substituted for a separate comms unit resembling the Astray Blue Frame D's head DRAGOONs; the antennae are durable and sharp enough to detach and use as knives with unusually-high cutting power.

Aside from the above, Leo's G-Stream carries a standard pistol and saber, and can optionally carry a shield, though Leo has apparently never done this even before becoming Chaser.

Chaser Armor
"Signal Bolt! Rider: Chaser! (rock and roll solo)"

- Transformation announcement for the Signal Chaser in the Mach Driver The true form of Leo's G-Stream, accessed through the Signal Chaser and Mach Driver, the Chaser armor is a set of armor parts that manifests on top of the G-Stream's frame, altering its appearance to resemble a Gundam-type and granting it vastly increased durability. In this form, Leo's pistol is upgraded to the Break Gunner, a twin-barreled gunblade, and the saber is replaced with the Tuner Axe, a custom beam halberd that deals crushing blows and can be charged even further to finish off tougher opponents. If Leo is carrying a shield when he activates the Chaser armor, it is upgraded into the Dead Liberation, which has a beam cannon installed on it; however, this drains a large amount of energy and is very heavy, making it unreliable for prolonged use. As mentioned above, Leo also refuses to use a shield in general, meaning that the Dead Liberation's existence is only confirmed in lore cards for much of the game's story.

The Chaser armor's most powerful technique, however, lies in the particle accelerator that manifests on the G-Stream's backpack when it attaches. Through a mixture of gravity and time dilation, the device can emit a distortion field that slows down everyone within a certain radius that Leo chooses to target.